Functions and features:
1) Offer 4 / 8 RJ11 output ports to connect 4 / 8 sensors or display systems.
2)  Offer 2 online RJ12 ports for 2 or more 4/ 8-port alarm unit using at same time to be 12/16/20/24/28/32-port central control alarm system.
3)  Offer 1 external remote RJ12 port to connect various external alarm signal / siren such as ES521IR to realize long-distance remote function.
4)  Metal case, LED indication function to show work condition of every defense area.
5)  Can customize wifi Bluetooth reception function.
6)  Built-in rechargeable lithium battery with 7 days standby time in maximum, low battery indication function.
7)  Alarm will be triggered when alarm unit is detached.
8)  Code modification function.
9)  Offer power switch.
10) Built-in short-circuit protection function.

Main parameters:
1)  Size: 185 X 80 X 36mm.
2)  Case: metal
3)  Output port: 4 / 8 ports of RJ11
4)  Alarm volume: ≥100DB.
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: DC

Optional accessories:
1)  Power adapter: 5V/8A.
2)  AS3X series IR remote keys.
3)  ES521IR external remote signal.
4)  RJ-2 cable.