... time! A,system advantages: Wireless GSM / GPRS / MODEM pool built on the broad masses of the personal ... information transfer on time; 4,to avoid high communication costs to be incurred in a month; 5, ... send speed as 16 times as single channel MODEM.It uses the development of WAVECOM module,220V ... time!A,system advantages:Wireless GSM / GPRS / MODEM pool built on the broad masses of the personal ...