producing area:China payment:T/T, L/C supplying capacity:take imported industry grade module as the center, carry throughcomplete industry grade design for the whole equipment, possesses high abilityof anti-jamming and stability. 8. High reliability: data transmission is achieved by message service function ofGSM network, reliable and with exceeding long distance transmission: as long asthere is China mobile GSM network cover, it will transmit the data. 9. Strong function of data-base query.