... places 5.CE approval The GSM/GPRS MMS alarm system bases on the GSM network, integrates the communication technology, ... store, garage, school, company, telecom and so on.2.Simple and elegant appearance, built-in storage battery ... alarm, emergency call, 1channel relay output, lithium battery interface. Size: 212mm×162mm×39mm Product photoFactoryWorkshopOffice color gsm wireless intelligent alarm system ...