Alarm to hostgsm receiving frequency433mhz unobstructed effective range mopen area wireless zones99 wireless zones sms phone numbers6 alarm to user phone numbers6 alarm to center phone numbers2 sound recordingyes alarmdisalarm typewireless keyboard phone sms local alarm sound scale dbm120db output power supply vusb dc5v 1a power supply typebuilt in li battery battery working time hours8 operating humidity rh