... channel modem. It uses the development of WAVECOM module, 220V power supply, can be long time stability, generous luxury housing.industrial- ... the size), especially suitable for the use of multiple macines at the same time.A, system advantages:Wireless GSM/GPRS /MODEM ... can make use of multiple parallel processing terminal to send nd receive text messages, thus saving a lot of time time-saving 8 PORts ...