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The H8921 4G Dual SIM Industrial Router from Hongdian is engineered for demanding IoT environments where connectivity must be uninterrupted and secure. Dual SIM redundancy, multiple VPN tunnels, and auto-failover between cellular, wired, and WiFi paths ensure your operations stay connected. Ideal for smart retail, ATMs, POS systems, unattended cabinets, and remote monitoring applications.

With Dual SIM failover and link backup, H8921 provides a reliable network connection for users. It can also provide high-quality network services by dual-SIM failover, VRRP, multi-layer auto-detection and recovery of links failures.

H8921 fully supports mainstream VPN protocols,including PPTP, L2TP, IPSec, OpenVPN, and GRE. Multiple high-encryption methods make data safe transmission up to financial-level standards.

4×LAN + 1×WAN Ethernet, RS-232 and RS-485 serial ports, optional GNSS.

Improve network switching efficiency and ensure network stability. Improve network security and avoid broadcast storms. The network is more flexible, the data is safer, and the operation is more efficient.

Metal shell, IP30 protection. EMC level 3. Wide operating temperature: -30℃~70℃.

Wall-mount installation supported, ensuring flexible integration in diverse environments.

Managed by Hongdian Cloud Server with SD-WAN networking, remote access anytime anywhere.


| Hardware | |
| CPU | MIPS 24Kc @580 MHz |
| RAM | 128MB |
| FLASH | 16MB |
| Cellular Interface | |
| Modem | 1 or 2 x LTE CAT4 |
| Number of antennas | 2 |
| Connector | SMA-K |
| SIM | 2 x Mini SIM (2FF) |
| Ethernet Interface | |
| Number of ports | 5 x 10/100 Mbps, Ethernet |
| Configuration | 5 x LAN or 4 x LAN + 1 x WAN |
| Wireless interface | |
| Standards | 802.11b/g/n, AP or station mode |
| Frequency bands | 2.4 GHz |
| Speed | 150Mbps |
| Security | WEP, WPA, WPA2 |
| Encryption | 64/128 AES, TKIP |
| Antennas | 1 |
| Connector | RPSMA-K |
| GNSS interface | |
| Number of antennas | 1 (only for GPS version) |
| Connector | SMA-K with 50 ohms impedance |
| Seiral interface | |
| Type | 1 x RS-232 + 1 x RS-485 serial port |
| Socket form | 1 x 6-pin 3.5 mm female socket |
| Signal definition | RX,TX,GND (RS-232) |
| A+,B-,GND (RS-485) | |
| Baudrate | RS-232 (300-115200bps) |
| RS-485 (300-115200bps) | |
| Software | |
| Auto fail-over | Between: 2 Cellulars Cellular and WAN Cellular and Wi-Fi (station mode) WAN and Wi-Fi (station mode) |
| Network protocols | PPP, PPPoE, TCP, UDP, IPv4, IPv6, SSL, DHCP, ICMP, NAT, HTTP, HTTPs, DNS, ARP, NTP, Telnet, SSH, DDNS, etc. |
| Network | APN, VPDN, VLAN, QoS |
| Routing | Static Routing, Policy routing, RIP, OSPF, etc. |
| Firewall | NAT, PAT, DMZ, Port Forword IP/Domain/MAC Filter, Access Control List |
| VPN | PPTP/L2TP/GRE/IPSec/OpenVPN/DMVPN/WireGuard |
| Ipsec Encryption | DES, 3DES, AES128, AES192, AES256 |
| OpenVPN Encryption |
BF-CBC, DES-CBC, RC2-CBC, DES-EDE-CBC, DES-EDE3-CBC, DESX-CBC, RC2-40-CBC, CAST5-CBC, RC2-64-CBC, AES-128-CBC,AES-192-CBC, AES-256-CBC, SEED-CBC |
| Remote Management | HTTP, Telnet, SSH, SMS, SNMP V1/V2/V3, SNMP TRAP, Hongdian Sandora Cloud Platform, SDLAN |
| Serial ports function | Transparent, etc. |
| Power Supply and Consumption | |
| Power Connector | DC socket |
| Voltage input | +5V~+36V DC |
| Power consumption | Idle: 200mA@12V DC |
| Data transceiving:550mA@12V DC | |
| Others | |
| Reset button | Yes |
| LED indicators | 10 x indicators for PWR, SYS, WAN, LAN1~LAN4, RF, NET, WLAN |
| Hardware watchdog | Yes |
| Physical Characteristics | |
| Ingress protection | IP30 |
| Housing & Weight | Metal, 540g |
| Dimension | 176×105×25(mm) |
| Installations | Desktop, wall mounting |
| Operating temperature | -30 ~ +70℃ |
| Storage temperature | -40 ~ +85 °C |
| Relative humidity | 0~95%(no condensation) |
| EMC | |
| ESD | EN61000-4-2, level3 |
| RS | EN 61000-4-3, level3 |
| EFT | EN 61000-4-4, level3 |
| CS | EN 61000-4-6, level3 |
| Certifications | CE, FCC* |


| Part No. | Mobile | Band | Region |
SIM Slots |
Ethernet ports | Wifi standard |
Wifi MIMO |
GPS | RS-232 | RS-485 |
| H8921-L4EU-CS-W | LTE Cat4 | LTE FDD:B1/3/5/7/8/20/28 LTE TDD:B38/40/41 WCDMA:B1/5/8 GPRS/EDGE:B3/8 |
EMEA(Europe, the Middle East, Africa)/APAC(Non-CN/JP)/SA(South America) | 2 | 5 | n | 1×1 | × | 1 | 1 |
| H8921-L4EA-CS-rWG | LTE Cat4 | LTE-FDD:B1/3/5/7/8/20 LTE-TDD:B38/40/41 WCDMA:B1/5/8 GSM/EDGE:B3/8 |
EMEA(Europe, the Middle East, Africa)/Korea/Thailand/India | 2 | 5 | n | 1×1 | yes | 1 | 1 |
| H8921-L4EA-CS-rW | LTE Cat4 | LTE-FDD:B1/3/5/7/8/20 LTE-TDD:B38/40/41 WCDMA:B1/5/8 GSM/EDGE:B3/8 |
EMEA(Europe, the Middle East, Africa)/Korea/Thailand/India | 2 | 5 | n | 1×1 | × | 1 | 1 |
| H8921-2L4EA-CS-rW | LTE Cat4 | LTE-FDD:B1/3/5/7/8/20 LTE-TDD:B38/40/41 WCDMA:B1/5/8 GSM/EDGE:B3/8 |
EMEA(Europe, the Middle East, Africa)/Korea/Thailand/India | 2 | 5 | n | 1×1 | × | 1 | 1 |
| H8921-L4NA-CS-rWG | LTE Cat4 | LTE-FDD:B2/4/5/12/13/14/66/71 WCDMA:B2/4/5 |
North America | 2 | 5 | n | 1×1 | yes | 1 | 1 |
| H8921-L4LN-CS-rWG | LTE Cat4 | LTE-FDD:B1/2/3/4/5/7/8/28 LTE-TDD:B40 WCDMA:B1/5/8 GPRS/EDGE:B3/8 |
LATAM(Latin America)/ANZ(Australia and New Zealand) | 2 | 5 | n | 1×1 | yes | 1 | 1 |
| H8921-L4NA-CS-rW | LTE Cat4 | LTE-FDD:B2/4/5/12/13/14/66/71 WCDMA:B2/4/5 |
North America | 2 | 5 | n | 1×1 | × | 1 | 1 |
| H8921-L4LN-CS-rW | LTE Cat4 | LTE-FDD:B1/2/3/4/5/7/8/28 LTE-TDD:B40 WCDMA:B1/5/8 GPRS/EDGE:B3/8 |
LATAM(Latin America)/ANZ(Australia and New Zealand) | 2 | 5 | n | 1×1 | × | 1 | 1 |
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