... now i can make sure you dont think it is guard against thief product ,because it hide indside the doll3 ... ,because if some people shake your something such as car ,box ,home door ,,the other doll speak can say ... you4.the batter use 12V23A,no need change the car wire ,fit any product ,inform distanct is more ... than 500-1kmso if you drive your car go shopping ,dont worry ,because the 500-1km ...