... sale Wireless Alarm System with Built-in Rechargeable Battery Auto Dial alarm burglar alarm system Functions: ... cut Auto charge/discharge, the built in battery provides 24 hours backup when the power ... AC, 10% 9V DC, and 300mA Backup battery: NiNH rechargeable battery, 7.2V DC 270mAh Working current: LS = ... control panel, one per, one wireless door contact, one wired siren, 2 remote control, and one ...