1.GSM Alarm System with relay output 2. Got CE/FCC/CCC 3.OEM ... warehouses, orchards, factory floors ,etc.Business/Home GSM Alarm System with:1.GSM 900/1800/1900 bands , can be used all ... over the world. 2.Full duplex communication with the base.3.Monitor environment on the spot.4.Voice ... 1 siren, 2 remote controllers, 1 power supply, 1 manual Hot selling GSM Alarm System with relay output (M3B)