Alarm to hostgsm receiving frequency433mhz wireless zonessupport 50 pieces of wireless detectors 8 pieces of remote controllers sms phone numbers6 alarm to user phone numbers6 alarm to center phone numbers5 sound recordingyes alarmdisalarm typephone sms local alarm sound scale dbmabout 115db more or less output power supply vdc5v 2a power supply typebuilt in li battery battery working time hoursabout 8 hours operating humidity rhless than 95 rh no congelati