... also receiving the alarm via GSM cellular network. The receiver is compatible with ADEMCO CONTACT ID , ADEMCO 4+2 Express, ,3/1,4 ... .Support PSTN (telephone line) and GSM cellular for alarm receiving.Compatible with Contact ID, ADEMCO 4+2 Express, ,3/1,4/1 ... 300 alarm records, works as standalone units when PC is off.Equipment with standard two telephone channels, (maximum 16 channels) and one ...