[UPGRADED DOG TRAINING AND BEHAVIOR AID TOOL]: Adopting the latest ultrasonic technology, the anti barking device will automatically emit a high-pitched tone that only can hear. Automatically sense the dog's sound, once the dog stops barking, the ultrasonic barking controller automatically stops emitting ultrasonic waves. [ ANTI-BARKING OF ALL SIZES AND BREEDS]: The anti barking device has a choice of 4 sensitivities. The environment can be set up with the best suitable gear, the induction distance can be , adjust the sensitivity to achieve. Level 1 is the least sensitive and level 4 is the most sensitive. [SAFE FOR AND HUMANS]: Dog barking with no electric shock, no irritating smell, and no beeping, safe for pets and harmless to humans, the anti barking device will automatically send out ultrasonic waves to stop the dog from barking, perfect for letting you go when you leave your dog The dog keeps quiet and creates a quiet environment to your family and neighbors. If the dog is hard of hearing or aggressive, the device may not work as intended. [USB RECHARGEABLE DOG BARKING ]: Rechargeable anti barking device with indicator light can be used effortlessly. saving you endless hassle and battery investment. it works right out of . (It is recommended to fully charge before use, the effect will be better) [STOP DOG BARKING INDOORS & OUTDOORS]: Anti barking device tested to get the best results within 32 feet, it completely frees your hands compared to traditional dog trainers. You can easily train your dog's behavior by turning on the knob. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you With battery Material: ABS colour: black Package Contents: 1 x Anti Barking Device 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.