1) When the line broken or short circuit, it will send out alarm voice
2) Protect the cell phone,laptop computer,digital products, GPS, ETC
* Using method:
1) Open the battery board, distinguish anode and cathode, put into 6F22, 9V Battery (in order to prolong the life of the products, suggest to use alkaline batteries),and then cover the board.
2) Stick the sensor detector on the product; put the switch onto "ON",it sets up defense. If someone cut down the line, prize up the sensor detector or combine the lead, it will warm.
3) When the volume becomes low obviously, please change the battery immediately. if you do not use it in a long time, please take off the battery.