A2 Alarm Controller

A2 alarm controller Slender rectangle-shaped two-way alarm controller. Major parameters: 1) Inbuilt battery type: 9V battery. 2) Exterior power adapter: DC-5V / 1.5A. 3) Maximum battery standby: 1 year. 4) Alarm volume: 85-105db. 5) Alarm indication: red LED light twinkling. 6) Low battery indication: red LED twinkling with a "beep" given. 7) Turn on / off alarm: sound & light indication. 8) Charger function: 4.2-5V charger output for mobile phone. 9) Alarm switch: Key