Basic Info.
Model NO.
Eudemon1000E-F15 DC
Interface
Network Interface
Storage Method
Flash Memory
Supporting System
Windows XP
USB Memory Port
USB Memory Port
Dimensions (H X W X D)
43.6*442*420mm
Power Supplies
Optional Dual AC or DC Power Supplies
Fixed Interface
8*Ge Combo+4*Ge(RJ45)+4*Ge(SFP)+6*10ge(SFP+)
Operating Temperature
0 to 45
Application 1
Data Center, Carriers, Isps, Various Industries
Features
Easy to Install and Deploy
Input Voltage AC
100V to 240V, 50/60Hz
Input Voltage DC
-48V to 60V
Url Filtering: Categories
More Than 130
Product Description
Product Description
HiSecEngine Eudemon1000E-F Series AI Firewalls
Eudemon1000E-F15-DC
The Eudemon1000E-F series AI firewalls are new-generation firewalls developed by Hua-wei, in either desktop or 1 U models,to meet the needs of carriers,enterprises, and next-generation data centers. It combines industryleading
security technologies such as access control, intrusion prevention (IPS), anti-virus (AV), URL filtering, anti-spam, and data loss prevention with rich security,robust processing and carrier-class reliability. Inheriting the Eudemon
series' outstanding firewall, VPN,and routing features, it helps you build a fast, efficient, and secure network.Product HighlightsComprehensive and Integrated Protection
• Integrates the traditional firewall, VPN, intrusion prevention, antivirus, data leak prevention, bandwidth management, URL filtering, and online behavior management functions all in one device. • Implements refined bandwidth management based on applications and websites, preferentially forwards key services, and ensures bandwidth for key services. • Comes with an antivirus content-based detection engine (CDE) powered by intelligence technologies that helps detect unknown threats, and provides in-depth data analysis to gain insight into threat activities and quickly detect malicious files,effectively improving the threat detection rate.
Easy Security Management
• Rapid deployment security polices using scenario template.
• Complies with the minimum permission control principle and automatically generates policy tuning suggestions based on network traffic and application risks.
• Analyzes the policy matching ratio and discovers redundant and invalid policies to remove policies and simplify policy management.
•Supports Hua wei SecoManager to achieve a unified configuration, management and maintenance of all devices.
High Performance
• Uses the network processing platform, improving forwarding performance significantly.
• Enables pattern matching and accelerates encryption/ decryption, improving the performance for processing IPS, antivirus, and IPSec services.
High Port Density
• The device has multiple types of interfaces, such as 100G, 40G, 10G, and 1G interfaces. Services can be flexibly expanded without extra interface cards.
Ordering Information
Eudemon1000E-F01-AC | Eudemon1000E-F01Transporter Desktop (10xGE RJ45 + 2xGE SFP) |
Eudemon1000E-F05-AC | Eudemon1000E-F05 AC Host (2*GE RJ45+8*GE COMBO+2*10GE SFP+, 1 AC power supply) |
Eudemon1000E-F08-AC | Eudemon1000E-F08 AC Host (2*GE RJ45+8*GE COMBO+2*10GE SFP+, 1 AC power supply) |
Eudemon1000E-F08-DC | Eudemon1000E-F08 DC Host (2*GE RJ45+8*GE COMBO+2*10GE SFP+, 1 DC power supply) |
Eudemon1000E-F15-AC | Eudemon1000E-F15 AC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+6*10GE SFP+, 1 AC power supply) |
Eudemon1000E-F15-DC | Eudemon1000E-F15 DC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+6*10GE SFP+, 1 DC power supply) |
Eudemon1000E-F25-AC | Eudemon1000E-F25 AC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+6*10GE SFP+, 1 AC power supply) |
Eudemon1000E-F25-DC | Eudemon1000E-F25 DC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+6*10GE SFP+, 1 DC power supply) |
Eudemon1000E-F35-AC | Eudemon1000E-F35 AC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 AC power supply) |
Eudemon1000E-F35-DC | Eudemon1000E-F35 DC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 DC power supply) |
Eudemon1000E-F55 -AC | Eudemon1000E-F55 AC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 AC power supply) |
Eudemon1000E-F55 -DC | Eudemon1000E-F55 DC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 DC power supply) |
Eudemon1000E-F85-AC | Eudemon1000E-F85 AC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 AC power supply) |
Eudemon1000E-F85-DC | Eudemon1000E-F85 DC Host (8*GE COMBO+4*GE RJ45+4*GE SFP+10*10GE SFP+, 2 DC power supply) |
Eudemon1000E-F125-AC | Eudemon1000E-F125 traffic desk (2xQSFP28 + 2xQSFP+ + 8xZSFP+ + 20xSFP+,2 AC power supplies) |
Eudemon1000E-F125-DC | Eudemon1000E-F125 traffic desk (2xQSFP28 + 2xQSFP+ + 8xZSFP+ + 20xSFP+,2 DC power supplies) |
Eudemon1000E-F205-AC | Eudemon1000E-F205 AC Host (4*QSFP28 + 16*ZSFP+ + 8*SFP+, 2 AC power supplies) |
Eudemon1000E-F205-DC | Eudemon1000E-F205 AC Host (4*QSFP28 + 16*ZSFP+ + 8*SFP+, 2 DC power supplies) |
Technical specification
1.Eudemon1000E-F01 / Eudemon1000E-F05 / Eudemon1000E-F08Performance and Capability | Eudemon1000E-F01 | Eudemon1000E-F05 | Eudemon1000E-F08 |
IPv4 Firewall Throughput1 (1518/512/64-byte, UDP) | 2.5/2.5/2.5 Gbps | 5/5/4 Gbps | 9/8/4 Gbps |
IPv6 Firewall Throughput1 (1518/512/84-byte, UDP) | 2.5/2.5/2.5 Gbps | 5/5/2.65 Gbps | 9/8/2.65 Gbps |
Firewall Throughput (Packets Per Second) | 1.8 Mpps | 6 Mpps | 6 Mpps |
Firewall Latency (64-byte, UDP) | 18 us | 18 us | 18 us |
FW + SA* Throughput2 | 1.8 Gbps | 2.5 Gbps | 3 Gbps |
NGFW Throughput (HTTP 100K)3 | 1.6 Gbps | 2.1 Gbps | 2.2 Gbps |
NGFW Throughput (Enterprise Mix)4 | 800 Mbps | 1.1 Gbps | 1.3 Gbps |
Threat Protection Throughput (HTTP 100K)7 | 1.3 Gbps | 1.8 Gbps | 2 Gbps |
Threat Protection Throughput (Enterprise Mix)5 | 700 Mbps | 1 Gbps | 1.2 Gbps |
Concurrent Sessions (HTTP1.1)1 | 300,000 | 4,000,000 | 4,000,000 |
New Sessions/Second (HTTP1.1)1 | 20,000 | 80,000 | 80,000/s |
IPSec VPN Throughput1 (AES-256 + SHA256, 1420-byte) | 2 Gbps | 3.7 Gbps | 3.7 Gbps |
Maximum IPSec VPN Tunnels (GW to GW) | 1,000 | 4,000 | 4,000 |
Maximum IPSec VPN Tunnels (Client to GW) | 1,000 | 4,000 | 4,000 |
SSL VPN Throughput6 | 200 Mbps | 500 Mbps | 500 Mbps |
Concurrent SSL VPN Users (Default/Maximum) | 100/100 | 100/1000 | 100/1000 |
Security Policies (Maximum) | 3,000 | 15,000 | 15,000 |
Virtual Firewalls | 10 | 100 | 100 |
URL Filtering: Categories | More than 130 |
URL Filtering: URLs | Can access a database of over 200 million URLs in the cloud |
Automated IPS Signature Updates | Yes, an industry-leading security center from Hua wei |
Centralized Management | Centralized configuration, logging, monitoring, and reporting is performed by Hua wei SecoManager |
VLANs (Max) | 4094 |
VLANIF Interfaces (Max) | 1000 |
High Availability Configurations | Active/Active, Active/Standby |
Dimensions (H×W×D) mm | 43.6×250×210 | 43.6×442×420 |
Form Factor/Height | Desktop | 1U |
Fixed Interface | 10*GE RJ45+2*GE SFP | 2*GE RJ45+8*GE COMBO+2*10GE SFP+ |
USB Port | 1×USB 2.0 Port | 2×USB 2.0 Port |
Weight (Empty Configuration) | 1.55 kg | 5.46 kg |
Local Storage | Optional, 64 GB microSD card available for purchase | Optional, M.2 SSD (64 GB/240 GB), hot-swappable |
Maximum Power Consumption | 36W | 49.5W |
Input Voltage | AC: 100V to 240V, 50/60Hz DC: -48V to 60V |
Power Supplies | Single power supply | Optional dual AC or DC power supplies |
Operating Environment (Temperature/Humidity) | Temperature: 0°C to 45°C (without optional HDD); 5°C to 40°C (with optional HDD) Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Non-operating Environment | Temperature: -40°C to +70°C Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Non-operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Noise | Maximum value < 72 Dba |
2.Eudemon1000E-F15 / Eudemon1000E-F25Performance and Capability | Eudemon1000E-F15 | Eudemon1000E-F25 |
IPv4 Firewall Throughput1 (1518/512/64-byte, UDP) | 15/15/15 Gbps | 25/25/25 Gbps |
IPv6 Firewall Throughput1 (1518/512/84-byte, UDP) | 15/15/15 Gbps | 25/25/25 Gbps |
Firewall Throughput (Packet per Second) | 22.5 Mpps | 37.5 Mpps |
Firewall Latency (64-byte, UDP) | 18 µs | 18 µs |
FW + SA* Throughput2 | 8 Gbps | 12 Gbps |
NGFW Throughput3 | 6 Gbps | 10 Gbps |
NGFW Throughput (Enterprise Mix)4 | 4.6 Gbps | 5 Gbps |
Threat Protection Throughput (Enterprise Mix)5 | 4 Gbps | 4 Gbps |
Concurrent Sessions (HTTP1.1)1 | 10,000,000 | 10,000,000 |
New Sessions/Second (HTTP1.1)1 | 250,000 | 250,000 |
IPSec VPN Throughput1 (AES-256 + SHA256, 1420-byte) | 15 Gbps | 25 Gbps |
Maximum IPSec VPN Tunnels (GW to GW) | 15,000 | 15,000 |
Maximum IPSec VPN Tunnels (Client to GW) | 15,000 | 15,000 |
SSL VPN Throughput6 | 1 Gbps | 1.5 Gbps |
Concurrent SSL VPN Users (Default/Maximum) | 100/2000 | 100/2000 |
Security Policies (Maximum) | 40,000 | 40,000 |
Virtual Firewalls | 1000 | 1000 |
URL Filtering: Categories | More than 130 |
URL Filtering: URLs | Can access a database of over 200 million URLs in the cloud |
Automated IPS Signature Updates | Yes, an industry-leading security center from Hua wei |
Centralized Management | Centralized configuration, logging, monitoring, and reporting is performed by Hua wei SecoManager |
VLANs (Max) | 4094 |
VLANIF Interfaces (Max) | 1000 |
High Availability Configurations | Active/Active, Active/Standby |
Dimensions (H×W×D) mm | 43.6×442×420 |
Form Factor/Height | 1U |
Fixed Interface | 8*GE COMBO+4*GE(RJ45)+4*GE(SFP)+6*10GE(SFP+) |
USB Port | 1×USB 3.0 Port |
Weight (Empty Configuration) | 6.3 kg |
Local Storage | Optional, SATA (1×2.5 inch) supported, 240 GB/960 GB/1000 GB |
Maximum Power Consumption | 222W |
Input Voltage | AC: 100V to 240V, 50/60Hz DC: -48V to 60V |
Power Supplies | Optional dual AC or DC power supplies |
Operating Environment (Temperature/Humidity) | Temperature: 0°C to 45°C (without optional HDD); 5°C to 40°C (with optional HDD) Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Non-operating Environment | Temperature: -40°C to +70°C Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Non-operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Noise | Maximum value < 72 Dba |
3.Eudemon1000E-F35 / Eudemon1000E-F55 / Eudemon1000E-F85Performance and Capability | Eudemon1000E-F35 | Eudemon1000E-F55 | Eudemon1000E-F85 |
IPv4 Firewall Throughput1 (1518/512/64-byte, UDP) | 35/35/35 Gbps | 50/50/40 Gbps | 80/80/40 Gbps |
IPv6 Firewall Throughput1 (1518/512/84-byte, UDP) | 35/35/25 Gbps | 50/50/25 Gbps | 80/80/25 Gbps |
Firewall Throughput (Packet per Second) | 52.5 Mpps | 60 Mpps | 60 Mpps |
Firewall Latency (64-byte, UDP) | 18 µs | 18 µs | 18 µs |
FW + SA* Throughput2 | 18 Gbps | 25 Gbps | 25 Gbps |
NGFW Throughput3 | 15 Gbps | 18 Gbps | 18 Gbps |
NGFW Throughput (Enterprise Mix)4 | 8 Gbps | 8 Gbps | 8 Gbps |
Threat Protection Throughput (Enterprise Mix)5 | 7 Gbps | 7 Gbps | 7 Gbps |
Concurrent Sessions (HTTP1.1)1 | 20,000,000 | 20,000,000 | 25,000,000 |
New Sessions/Second (HTTP1.1)1 | 500,000 | 500,000 | 750,000 |
IPSec VPN Throughput1 (AES-256 + SHA256, 1420-byte) | 30 Gbps | 30 Gbps | 30 Gbps |
Maximum IPSec VPN Tunnels (GW to GW) | 20,000 | 20,000 | 20,000 |
Maximum IPSec VPN Tunnels (Client to GW) | 20,000 | 20,000 | 20,000 |
SSL VPN Throughput6 | 3 Gbps | 3 Gbps | 5 Gbps |
Concurrent SSL VPN Users (Default/Maximum) | 100/5000 | 100/5000 | 100/5000 |
Security Policies (Maximum) | 60,000 | 60,000 | 60,000 |
Virtual Firewalls | 1000 | 1000 | 1000 |
URL Filtering: Categories | More than 130 |
URL Filtering: URLs | Can access a database of over 200 million URLs in the cloud |
Automated IPS Signature Updates | Yes, an industry-leading security center from Hua wei |
Centralized Management | Centralized configuration, logging, monitoring, and reporting is performed by Hua wei SecoManager |
VLANs (Max) | 4094 |
VLANIF Interfaces (Max) | 1000 |
High Availability Configurations | Active/Active, Active/Standby |
Dimensions (H×W×D) mm | 43.6×442×420 |
Form Factor/Height | 1U |
Fixed Interface | 8*GE COMBO+4*GE(RJ45)+10*10GE(SFP+) |
USB Port | 1×USB 3.0 Port |
Weight (Empty Configuration) | 7.3 kg |
Local Storage | Optional, SATA (1×2.5 inch) supported, 240 GB/960 GB/1000 GB |
Maximum Power Consumption | 242W |
Input Voltage | AC: 100V to 240V, 50/60Hz DC: -48V to 60V |
Power Supplies | Dual AC or DC power supplies |
Operating Environment (Temperature/Humidity) | Temperature: 0°C to 45°C (without optional HDD); 5°C to 40°C (with optional HDD) Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Non-operating Environment | Temperature: -40°C to +70°C Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Non-operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Noise | Maximum value < 72 Dba |
4.Eudemon1000E-F125 / Eudemon1000E-F205Performance and Capability | Eudemon1000E-F125 | Eudemon1000E-F205 |
IPv4 Firewall Throughput1 (1518/512/64-byte, UDP) | 160/160/80 Gbps | 240/240/120 Gbps |
IPv6 Firewall Throughput1 (1518/512/84-byte, UDP) | 160/160/50 Gbps | 240/240/75 Gbps |
Firewall Throughput (Packet per Second) | 120 Mpps | 180 Mpps |
Firewall Latency (64-byte, UDP) | 35 µs | 35 µs |
FW + SA* Throughput2 | 50 Gbps | 75 Gbps |
NGFW Throughput3 | 36 Gbps | 54 Gbps |
NGFW Throughput (Enterprise Mix)4 | 16 Gbps | 24 Gbps |
Threat Protection Throughput (Enterprise Mix)5 | 14 Gbps | 21 Gbps |
Concurrent Sessions (HTTP1.1)1 | 50,000,000 | 75,000,000 |
New Sessions/Second (HTTP1.1)1 | 1,500,000 | 2,250,000 |
IPSec VPN Throughput1 (AES-256 + SHA256, 1420-byte) | 45 Gbps | 65 Gbps |
Maximum IPSec VPN Tunnels (GW to GW) | 40,000 | 60,000 |
Maximum IPSec VPN Tunnels (Client to GW) | 40,000 | 60,000 |
SSL VPN Throughput6 | 10 Gbps | 12 Gbps |
Concurrent SSL VPN Users (Default/Maximum) | 100/10,000 | 100/15,000 |
Security Policies (Maximum) | 60,000 | 60,000 |
Virtual Firewalls | 1000 | 1000 |
URL Filtering: Categories | More than 130 |
URL Filtering: URLs | Can access a database of over 200 million URLs in the cloud |
Automated IPS Signature Updates | Yes, an industry-leading security center from Hua wei |
Centralized Management | Centralized configuration, logging, monitoring, and reporting is performed by Hua wei SecoManager |
VLANs (Max) | 4094 |
VLANIF Interfaces (Max) | 1000 |
High Availability Configurations | Active/Active, Active/Standby |
Dimensions (H×W×D) mm | 43.6×442×600 |
Form Factor/Height | 1U |
Fixed Interface | 2*100GE(QSFP28)+2*40G(QSFP+)+ 8*25(ZSFP+)+20*10GE(SFP+) | 4*100GE(QSFP28)+16*25GE(ZSFP+) +8*10GE(SFP+) |
USB Port | 1×USB 3.0 Port |
Weight (Empty Configuration) | 7.3 kg | 10.2 kg |
Local Storage | Optional, SATA (1×2.5 inch) supported, 240 GB/960 GB/1000 GB |
Maximum Power Consumption | 222W |
Input Voltage | AC: 100V to 240V, 50/60Hz DC: -48V to 60V |
Power Supplies | Dual AC or DC power supplies |
Operating Environment (Temperature/Humidity) | Temperature: 0°C to 45°C (without optional HDD);5°C to 40°C (with optional HDD) Humidity: 5% to 95% (without optional HDD), non-condensing;5% to 95% (with optional HDD), non-condensing |
Non-operating Environment | Temperature: -40°C to +70°C Humidity: 5% to 95% (without optional HDD), non-condensing; 5% to 95% (with optional HDD), non-condensing |
Operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Non-operating Altitude (maximum) | 5,000 meters (without optional HDD); 3,000 meters (with optional HDD) |
Noise | Maximum value < 72 Dba |
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Company Profile
Our Advantages
The product is 100% genuine and has sufficient stock in stock;
Price discounts and fast delivery;
After sales service guarantee; Support sample and customization services.
FAQ
Q: Are you a trading company or a manufacturer? Can I use our own logo and label?
A: We are a trading company that provides domestic and international trade services. We also provide OEM/OEM services.
Q: What are the guarantees for product quality?
A: We have professional engineers who test each piece of equipment before shipment to ensure that the shipped products are in good condition.
Q: How did you resolve a defective product when I received it?
A: We have professional personnel to help you solve the problem. If the product is defective, we usually offer you a return, refund, or replacement of the defective product.
Q: What is your payment method and delivery time?
A: We accept credit cards, wire transfers, PayPal, and other payment methods. We also support fast shipping within 72 hours.
Q: What is the MOQ and how long is the warranty period?
A: The minimum order quantity for normal products is 1, and the product warranty period is usually 1 year.
Address:
Room 209, Unit 1, 2nd Floor, Building 1, No. 9 Anningzhuang West Santiao, Haidian District, Beijing, China
Business Type:
Manufacturer/Factory
Business Range:
Computer Products, Electrical & Electronics
Management System Certification:
ISO 9001, ISO 9000, ISO 14001, ISO 14000, HSE
Company Introduction:
Hengtian Hongyang (Beijing) Information Technology Co., Ltd. Was established in 2012 and is a high-tech private IT enterprise that integrates the sales of communication equipment. Since its establishment, the company has been committed to representing various communication equipment manufacturers′ products, including Huawei, ZTE, Avaya (Nortel), Fiberhome, Ericsson and other domestic and foreign frontline brands. It is a professional modern communication enterprise with scale and diversified business, Since its establishment, Hengtian Hongyang has continuously undertaken communication projects and provided private network solutions with its own technological advantages. At present, it has formed a certain leading technological advantage in the communication industry and has become a solution expert for different customer needs.
The company has a strong technical service and sales team, dedicated, innovative, and constantly pioneering. Our products are exported to Europe, the Americas, Southeast Asia, the Middle East, as well as neighboring countries such as Japan and South Korea; And has received unanimous praise from numerous foreign customers. The company will continuously improve itself and provide high-quality products and thoughtful services to all partners in the process, achieving a win-win situation.
The company upholds the corporate values of "integrity and innovation, win-win cooperation, passion and dedication, and inclusive dedication". We will continue to strive tirelessly, dedicating all our efforts to the development of China′s communication industry and forging ahead forever.
Main products:
IP microwave equipment: RTN905F, RTN910A, RTN950, RTN950A, RTN 980, RTN 980L, RTN320F, RTN 380ax, RTN510 AP, rtn 510 RT
OSN transmission equipment: OptiX OSN 9800, OptiX OSN9600, OptiX OS N8800, OptiX OSN 1800, OptiX OSN 7500, OptiX OSN 3500, OptiX PTN 7900, OptiX PTN 3900 series, OptiX PTN 1900 series, OptiX PTN 900 series, PTN 7900E-12/ 24/32.
Data communication equipment: CloudEngine 12800 series, CE8850-EI-B-B0B, CE8850-64CQ-EI, CE8850E-32CQ-EI, CloudEngine S16700, CloudEngine S12700E, CloudEngine 8850E-32CQ-EI, CE8851-32CQ8DQ-P, CloudEngine S9300X, NetEngine 5000E, CX600, ME60-X8A, ME60-X16A, NE40E-X8/X16A, NetEngine 8000 M14/M8/M6, NetEngine 8000 M1A/ M1C/ M1D-B/ F1A, Eudemon1000E-G15/G25/G35/G55, Eudemon200E-G85.
Server: 2288H V6, 5288V6, 1288H V6, NCE server
Storage: OceanStor Dorado 6800, OceanStor Dorado 5300/5500/5600, OceanStor 5210/5310/5510/5610, OceanStor Dorado 6000 V6.
Hengtian Hongyang (Beijing) Information Technology Co., Ltd
Contact person: ZhaI Yongchao
Address: Unit 209, Yipin Upper Floor 1, No. 9 Anningzhuang West Santiao, Haidian District, Beijing