---
id: introduction
title: Overview
sidebar_position: 3
---
The RLTK451 Industrial 4G Router, with its integrated 4G LTE, Wi-Fi, DIDO, serial port, Ethernet ports (4 LAN and 1 WAN),
VLAN, and VPN technologies, serves as a robust and reliable cellular VPN router, providing quality internet connectivity and high-speed data transmission for industrial devices.
The device facilitates the monitoring of devices through cloud-based remote management, increases efficiency in large-scale deployments and preventive maintenance, and reduces operational costs.
- **Online Monitoring**: Being aware of the network status in the field at all times and from anywhere.
- **Remote Operation and Maintenance**: Accessing the device's interface from anywhere without the need to go on-site for cloud-based configuration, parameter configuration, firmware updates, and batch operations without requiring a special network.
- **Exception Handling**: Maintenance personnel are immediately alerted when an anomaly occurs in the network.
The RLTK451 is a fully featured LTE router designed for mission-critical IIoT applications, equipped with smart software functions and industrial-grade design. The RLTK451 helps corporate customers achieve efficient large-scale network deployment and management by providing the best reliability, high speed, and secure communication, regardless of the locations of remote devices.
It is suitable for various M2M and industrial IoT applications such as Smart Grid, Automation, Digital Manufacturing, Transportation, ATMs, smart factories, solar energy, wind energy production, and smart medical care.
## General Features
### Stable and Reliable
- Industrial design, metal casing, IP30 protection class.
- Reverse polarity protection, wide input voltage range: 9-36 VDC.
- ESD, Overvoltage, EFT protection.
- Can be used with DIN rail mounting.
- In addition to hardware and software watchdogs, a multi-layer connection detection mechanism allows for self-recovery in unexpected failures and ensures reliable communication between remote devices and the data center.
- Offers comprehensive security measures for sensitive corporate data, including secure VPN transmission and firewall against network attacks.
### Flexible Network Structure
- Supports private network access via APN/VPDN as well as global 2G/3G/4G networks.
- Automatically detects cellular networks and switches between 4G/3G/2G modes.
- Provides seamless data transmission by automatically switching to an alternative backup connection thanks to failover support between 4G and WAN.
- Allows additional device access with 2.4 GHz Wi-Fi support and supports both wired and wireless Internet connections.
- Compatible with 5.8 GHz Wi-Fi (optional).
### Advanced Functions
- Supports importing/exporting configuration parameters that significantly increase efficiency for large-scale deployments.
- Supports DDNS, static routes, and easily accessible devices under the router.
- Supports firewall, NAT, DMZ, blacklist, and whitelist.
- Supports port-based VLAN separation, allowing network administrators to group hosts together even if they are not on the same network switches.
- Supports email/SMS/DO alarm and abnormal alert timing.
- Expands your interface options with comprehensive interfaces including 4 Ethernet ports, serial port R232/RS485 (alternative), USB, 2 DI, 2 DO, Wi-Fi, and GPS (optional).
- Supports user-defined registers and heartbeat packets for serial modem, transparent TCP/UDP protocol, and multi-center.
- Supports VPN (PPTP, L2TP, IPSec, OpenVPN, GRE) and VPN encryption functions suitable for various network and high-security requirement scenarios.