The most outstanding feature of this model is the voice prompt with seven hifi sentences. When it is trigger to alarm in arming, it frightens with voice. It adopts double sides sticker. The current for the whole machine is only 3MA. The unique micro-computer regulating circuit inside is out of our hard work. During the course of test-drive and selling, it can still work normally for a long time without storage battery on. Both the host and the controller is waterproof.