... . 3.With alarm interface .It can be linked with other security system when switch signal output. Use: Prevention for road, railway, ... strands have electric shock, intruder hard to break in.♥ LCD display function, directly show the voltage in the panel, user gets ... it clearly♥ 5 LED indicated lamp, display the working mode clearly.♥ Equipped with12V, 4AH backup battery, convenient ...