1) Wireless Alarm System with Built-in Rechargeable Battery and Auto Dial Function 2) ... HOT on sale Wireless Alarm System with Built-in Rechargeable Battery Auto Dial alarm burglar alarm system Functions ... from a remote phone, remote arm, disarm, listen in, and more Locally alarm when the phone line is ... cut Auto charge/discharge, the built in battery provides 24 hours backup when the power fails ...