... -way communication with speaker9) Three way to arm your house: outside armed, stay armed,remote armed10) Learning code, ... not lost even the power is off14) Built-in NI-HI rechargeable battery,it will automaticly to begin ... work when the power is off II. Security Alarm System Standard packing:1 Main panel,1 GSM antenna,1 ... battery,could last about 1 year.1 Built-in backup battery,1 AC/DC Adapter,1 User manual ...