Dog beeper for second generation, with 800M remote control. With 3.7V 700mAh rechargeable battery,full charge up to 4.2V ensures adequate power for optimal remote control. Product Features: The product built-in inductor, equipped with magnetic switch. Built-in buzzer, can produce 8 different "BIB" sounds. Set this product on the dog's neck, when the dog move fast, the product will emit a short "BIB" sound. When the dog move slow or doesn`t move, means the dog has been found the prey, then the product will emit urgent and continuous "BIB" sounds. For example: "BIB" for one sound represent first dog."BIB" For two consecutive sound represent the second dog, and so on, the hunter can control 8 dogs at the same time.