... alarm system, alarm, gsm alarm, home security, wireless alarm, accessory home alarm, home alarm system, home security system, alarm system, alarm, ... with all of our other products, like smoke detector ,gas decetoe ,PIR detector ,sensor and so on SPECIFICATION: 1) Working voltage ... receiving distance: 100m 6) Alarm volume: 110dBwidely using in home ,office ,power system ,ect place for the safety and ...