WDM201 is a Data Acquisition Module designed to allow remote monitoring of flow rate and liquid volume using wireless GPRS technology. Locations that were previously hard to access, such as water tanks in a village, buildings, machinery, infrastructure or moving vehicles can now easily be accessed and monitored. WDM201 is a specially designed low power battery-operated GPRS modem to acquire Frequency Bands : SIM900A Dual-band: EGSM900, DCS1800. The SIM900A can search the 2 frequency bands automaticallyCompliant to GSM Phase 22+GSM class: Small MSTransmitting power - Class 4 (2W) at EGSM 900- Class 1 (1W) at DCS 1800Liquid flow-rate and volume data stored and transmittedBattery operation allows use anywhere with simple installationBattery life of over 1 year*Maintenance-free systemSupports GPRS network automatic re-connection function