Functions and features: 1) Offer 1 RJ11 output port to connect 1 sensor or display system. 2) Simple appearance design, LED indication function to show work condition of every defense area. 3) Combine with DP1153Q display stand to become integrated table display system. 4) Built-in rechargeable lithium battery with 7 days standby time in maximum, low battery indication function. 5) Alarm will be triggered when alarm unit is detached. 6) Code modification function. Main parameters: 1) Size: 80 x 52 x 32mm. 2) Case: ABS. 3) Output port: 1 port of RJ11. 4) Alarm volume: 95DB. 5) Standby time of built-in rechargeable lithium battery: 7 days. 6) Code modification function: yes. 7) Low battery indication: yes. 8) External power on / off indication: yes. 9) Power input port: USB. Optional accessories: 1) Power adapter: 5V/2A USB power adapter. 2) AS3X series IR remote keys.