Manufacture Since 1999
Manufacture Since 1999
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Work with E-Lins engineering teams from product requirements and prototyping through validation and production.
Industrial 4G LTE and 5G connectivity products for reliable remote access, IoT networking, and mission-critical applications.
Industrial networking and control products designed to connect, manage, and integrate machines, devices, and field systems.
From product customization and industrial interfaces to firmware, hardware design, validation, and mass production support.
Connect distributed devices, industrial systems, and remote infrastructure with secure cellular networking, edge connectivity, and centralized management.
Real deployments from Smart City, Energy, Industrial Automation, Transportation, and Mining, measured in uptime, savings, and ROI.
500+ deployments
150+ countries
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The M400 series Cellular Modem is a complete wireless data modem providing global cellular network connectivity; where cellular signal available, with 3G/2G fallback capabilities for ensured access to the internet anywhere, providing RS232/RS485/USB port option. The M400 is an easy to install productivity tool designed to provide maximum accessibility to the mobile professional allowing quick access to the internet for real-time business transactions, email, web browsing and more.
Built-in 2G/3G/4G LTE industrial cellular module with sim card slot, insert SIM/UIM card to work directly. Can design dual sim modem slot. SIM failover/standby APN 2G/3G/4G failover for fixed line broadband connections External antenna connectors for high gain antennas replacement Support At command RS232/RS485/USB/RJ45 port option MIMO supported Support At command Option Features: Voice Supported Built-in TCP/IP Stack GPS
Quality industrial grade casing provides robust and reliable 4G modem for installation in many different environments and operating temperature of -35 Celcius to +75 Celcius
| M400 4G Modem This Model | MQ50 | H900pf-P2-W6 | H685 4G CAT12 Router | |
|---|---|---|---|---|
| Product Type | - | - | Indoor | - |
| Cellular Connectivity | - | - | Cellular | - |
| Connectivity Type | - | - | 5G SA/5G NSA | - |
| Ethernet Ports | - | - | 5 EH Ports | - |
| SIM Card | - | - | Dual SIM | - |
| Ethernet Speed | - | - | 10/100/1000Mbps | - |
| PoE | - | - | Active PoE Out/PoE PSE | - |
| Wi-Fi | - | - | Wi-Fi 6 | - |
| SFP Port | - | - | No SFP | - |
| Serial | - | - | RS232 | - |
| Features | - | - | Dual SIM/PoE Out/eSIM | - |
| Industrial Protocols | - | - | Modbus/DNP3/eSIM | - |
| Network Protocols | - | - | MQTT/TCP/UDP/IPv4/IPv6/DNS/HTTP/NTP/ICMP | - |
| Operating System | - | - | Linux | - |
| Power Socket | - | - | 3 PIN Jack | - |
| Datasheet | M400 4G Modem ↓ | MQ50 → | H900pf-P2-W6 → | H685 4G CAT12 Router → |
PDF · EN · v3.2 · 1.8 MB · Updated 2026-03
elins-m400-4g-modem-datasheet-v3.2.pdf
PDF · EN · SIM install, first login, APN setup in 10 minutes
elins-m400-4g-modem-quick-start-guide-v1.4.pdf
PDF · EN · 4.6 MB — full Web UI, CLI and network feature reference
elins-m400-4g-modem-user-manual-v2.8.pdf
PDF · EN · mounting, grounding, antenna & power wiring
elins-m400-4g-modem-hardware-installation-guide-v1.2.pdf
PDF · EN · cellular module AT commands, signal queries, SMS control
elins-m400-4g-modem-at-command-reference-v1.6.pdf
ZIP · Web UI upgrade image + MD5 checksum. Changelog: fixes IPsec rekey race, adds MQTT over TLS, improves B41 cell reselection.
elins-m400-4g-modem-firmware-v6.3.1.zip
ZIP · Batch configure, backup & restore multiple units over LAN
elins-config-tool-v2.1-win-linux-mac.zip
SNMP MIB, TR-069 notes and NMS open API — hosted on E-Lins Wiki
wiki.e-lins.com → M400 4G Modem · API
ZIP · Declaration of Conformity and test reports
elins-certificates-ce-fcc-rohs.zip
PDF · Cloud network management for all E-Lins devices
elins-nms-platform-datasheet.pdf
Standard lead time 2-4 weeks. All variants share the same H685T hardware platform with factory-fitted options. OEM/ODM customization (firmware, branding, enclosure) available from MOQ 1 unit for evaluation — production branding from 50 units. Reply within 4 hours.
| <img class="alignnone wp-image-2519" src="https://e-lins.com/en/wp-content/uploads/sites/14/2024/08/M400-Modem-Part-Number-1.png" alt="M400 Modem Part Number" width="1149" height="489" /><img class="alignnone wp-image-2520" src="https://e-lins.com/en/wp-content/uploads/sites/14/2024/08/M400-Models.png" alt="Suffix Explanation for M400 modem" width="1149" height="849" /><img class="alignnone wp-image-2521" src="https://e-lins.com/en/wp-content/uploads/sites/14/2024/08/Router-Modem-Ports-s-40.png" alt="E-Lins 4G 5G industrial router overview" width="1149" height="649" /><img class="alignnone wp-image-2517" src="https://e-lins.com/en/wp-content/uploads/sites/14/2024/08/Router-Modem-Radio-6.png" alt="Router-Modem-Radio" width="1149" height="981" /> |
|---|
Send your configuration and quantity — our sales engineers reply with a formal quote within 4 business hours. Samples ship worldwide from Shenzhen.
100+ distribution partners across Europe, Asia, the Middle East and the Americas hold stock and provide first-line support in your time zone.
Firmware, branding, enclosure, band sets and packaging tailored to your project — customization available from MOQ 1 unit for evaluation.
Standard pricing — order samples directly to validate your application.
Contact sales for volume discount and project pricing.
OEM pricing, custom firmware / branding and dedicated support included.
Conforms to EU EMC, RED and LVD directives for sale in the European Economic Area.
↓ Download certificateFCC Part 15 compliant for the United States market; test reports available.
↓ Download certificateRestriction of Hazardous Substances — environmentally responsible manufacturing.
↓ Download certificate
CE · FCC · RoHS coverage — carrier testing in 60+ countries
= field-tested on live networks. The H685T uses TDD-LTE bands — verify your carrier's band plan (B38/39/40/41) before ordering; FDD regions are served by the H820 series.
Standard H685T units are not ATEX-rated. For oil & gas, mining and chemical sites in Zone 1 / Zone 2 hazardous areas, E-Lins offers certified enclosure packages and intrinsic-safety consultation through OEM projects. Contact our engineering team with your zone classification for a compliant configuration.
Need carrier approvals (PTCRB, AT&T, Verizon), ATEX or other regional certifications for your project? Contact us — certification-on-request is available for volume orders.
Datasheets, manuals, firmware & tools for the H685T
Guides, changelogs & tutorials on wiki.e-lins.com
Post-sales technical support — reply within 24 h
Monitor & manage your H685T fleet remotely
On all H685T hardware, from ship date
No-questions-asked returns on standard units
Security & feature updates for product lifetime
These are the questions we hear most often from engineers and integrators evaluating our products for their projects. Can't find your answer here? Our team is ready to help.
Technical support replies to pre-sales inquiries within 4 business hours.
The product supports TDD-LTE Band 38 (2600 MHz), Band 39 (1900 MHz), Band 40 (2300 MHz) and Band 41 (2500/2600 MHz), with fallback to TD-SCDMA (2010-2025 / 1880-1920 MHz) and EDGE/GPRS/GSM quad-band (850/900/1800/1900 MHz). Other TDD-LTE band combinations are available on request - see the datasheet for the full band list.
Yes - the product is carrier-unlocked and accepts any standard SIM/UIM card. APN is auto-detected for most carriers. Before ordering, confirm your carrier operates TDD-LTE Bands 38/39/40/41; for FDD-LTE regions (most of Europe / the Americas), choose the H820 series instead.
Yes. With the RS232 or RS485 option, the router works as a serial-to-cellular DTU gateway, transparently tunneling Modbus RTU traffic from meters, PLCs and RTUs to your SCADA center over TCP/UDP. Configuration takes minutes in the Web UI.
Insert an activated SIM, connect power (5-40 V DC - 12 V / 24 V cabinet and vehicle supplies work directly), attach the antenna, and the router registers on the network within about a minute. Default Web UI is at 192.168.8.1; APN, failover and VPN are configured in a guided flow. Most sites go from unboxing to online in under 10 minutes.
Yes - the compact metal enclosure is designed for street cabinets, pole boxes and control panels, with a -35 °C to +75 °C wide-temperature design and enhanced ventilation. Wall-mount and DIN-rail kits are available as accessories; the Hardware Installation Guide covers grounding and wiring.
Yes. The product supports three-way failover between 4G/3G/2G cellular, wired WAN (xDSL via RJ45) and Wi-Fi client mode. You can choose cellular-preferred or WAN-preferred backup strategies, and a built-in watchdog automatically restarts the link if the connection drops - an always-online design.
Yes - a full VPN suite: PPTP, L2TP, IPsec and GRE, with IPsec PKI digital certificates and extended authentication for compatibility with third-party VPN concentrators. IP/MAC filtering and an SPI firewall protect against DoS attacks.
All E-Lins routers integrate with the E-Lins NMS cloud network management system - remote monitoring, bulk configuration, firmware upgrades and alerts. SNMP (MIB-II + private MIB), Telnet, SSH2, Web UI and SMS status control are also built in. Learn about NMS →
Yes - firmware updates run over the Web UI, via the Configuration Tool over LAN, or in bulk through E-Lins NMS for entire fleets. Dual-image fallback means a failed update never bricks a remote unit; the step-by-step procedure is documented on the Wiki.
Every product carries a 5-year limited hardware warranty, a 30-day return policy on standard units, and lifetime firmware updates. Extended warranty and advance-replacement SLAs are available for volume and OEM projects.
Yes. E-Lins has provided OEM/ODM services since 1999: custom firmware, branding, enclosure and feature options (RS232/RS485, GPS, SMS/voice control, RIP/OSPF/BGP, PoE). Evaluation customization starts from a single unit; production branding typically starts at 50 units.
Standard models have no MOQ — order one sample to validate your application. Standard lead time is 2-4 weeks depending on options and quantity; volume pricing starts at 10 units, OEM pricing at 50+. Request a quote and receive a formal offer within 4 business hours.
KEEP EXPLORING
Need Wi-Fi, 5G or an extended temperature range? These upgrades build on the M400 4G Modem platform.
The M300 series 4G modem with sim card slot is a compact, ruggedized industrial wireless USB modem providing global wireless cellular network connectivity, where cellular signal available, with 4G/3G/2G fallback capabilities for ensured access to the internet and private networks anywhere for wireless M2M and IoT.
The E-Lins industrial routers have been specially designed to be installed in extreme environmental conditions such as exterior racks, urban elements (street lights, information screens, bus stops, etc.), industrial warehouses, production lines, vehicles, exterior telesurveillance systems, etc.
IN THE BOX & ADD-ONS
Genuine E-Lins accessories tested with the M400 4G Modem: power, antenna, mounting and cabling.
Sample list — awaiting the accessory catalogue.
USE CASES · SOLUTIONS
See how system integrators deploy it across smart city, energy and transportation projects.
Cloud Platform · Included with E-Lins Routers
Monitor, configure and upgrade your entire fleet of M400 4G Modem routers from one cloud dashboard: bulk operations, real-time alerts and API integration. Cloud SaaS or private on-premise deployment.
Knowledge Base · Documentation
Configuration guides, firmware changelogs and field tutorials. Full documentation lives on the E-Lins Wiki.
The M400 series Cellular Modem is a complete wireless data modem providing global cellular network connectivity; where cellular signal available, with 3G/2G fallback capabilities for ensured access to the internet anywhere, providing RS232/RS485/USB port option.
