... 5.10, the host can be stored 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, AC power, phone short message ... , especially for garage, warehouse and other areas inaccessible to wired telephone network. Technical parameters1, standby current: 20mA2, supply voltage: 9V-12V3, Working ...