Supporting 2 radio links with single device, Bytton DM-4G gives users choice of simultaneously accessing 2 operators or to decide what type of traffic is permitted on 2 different SIM cards for same network. Router can split tunnel traffic to separate IP VPNs for data applications and web Internet. Unit supports RS232/RS485, USB, 3-port Ethernet LAN switch, and up to 2-port Ethernet WAN with optional WiFi access point allowing customers to connect to serial, Ethernet, and WiFi devices.