IAR-142(+)-4G isareliable IEEE 802.11b/g/nWLAN VPN router with2ports10/100Base-T(X) router where ETH1 for LAN and ETH2 for WAN. It supports 802.1X and MAC filter for security control. It could be configured to operate in3 modes of routing function:Dynamic/Static IP route,PPPoE authentication,and Modem dialup. In the mode of Modem dialup, it support GPRS/3G/3.5G/LTE modem by internal 4G LTE module. Users can set up WLAN environment to fulfill demands of various applications rapidly by dialing up cellular modems. Inaddition, IAR-142+-4G also provides P.D. feature on ETH1 which is fully compliant with IEEE802.3afPoEP.D. specification. This feature extends the layout up to 100 meters. Therefore, IAR-142+-4G is one of the best solution for applications of wireless communication.