... the code, simple and convenient.8, can be remote call or send text messages and other remote control arm ... 5 groups, a telephone number users.11, host a group message can be pre-set alarm center telephone, a group of a telephone call center.12, ... especially for garage, warehouse and other areas inaccessible to wired telephone network. Technical parameters1, standby current: 20mA2, supply voltage: 9V ...