... protocol(alarm information, status information, AC power off and recover, Low voltage, test)8. Support wireless “ding-dong” doorbell function 9. Alarm ... -Band is optional: 850/900/1800/1900Mhz)l GSM transmit power: 2W l Receiving and emitting range: >100m(non-block)l ... Humidity:5%~80%Standard package list1 Main alarm set, 2 wireless remote control,1 pir sensor,1 door sensor, 1 adaptor,1 ...