A4 Alarm Controller

A4 Square-shaped one-way alarm controller. Major parameters: 1) Inbuilt battery type: 3.6V/ER14250 lithium battery. 2) Exterior power adapter: DC-5V / 1.5A (RJ plug). 3) Maximum battery standby: 1 year. 4) Alarm volume: 85-105db. 5) Alarm indication: red LED light twinkling. 6) Tamper indication: green (or blue) LED light twinkling 7) Low battery indication: red LED twinkling with a "beep" given. 8) Turn on / off alarm: sound & light indication. 9) Charger function: 4.2-5V