The professional dog training device with cutting-edge ultra-sonic technology emits high-frequency sound waves that grab dogs" attention when they are excessively barking, safe and effective for dogs and humans. Dual super-effective sonic emitters send out 2 modes of sound frequency to stop different bad behaviors. This no-shock dog barking deterrent trains your dogs to be relaxed and trusting instead of terrified. It is good for dog owners to use them to establish habits and routines with their pets; the handheld type is also for those who are on walks or hikes to provide guard from strays. Features: Safe Dog Control Device: Dog anti-barking devices emit an ultrasound of 15-30kHz, which exceeds the coverage of human hearing but can easily attract the dog"s attention without hurting your dog like a dog whistle. Two Different Modes: Drive away stray dogs with high-power ultra-sonic, or stop dogs from barking with flashing LED lights + ultra-sonic. The LED light can also be used as a flashlight for walking your dog at night. Multi-functional: This dual-head trainer also stops your pet"s bad behaviors such as fighting, biting, eating hazardous things, etc. Our upgraded barking stopper is an effective tool without causing injury to your dog. Long-Lasting Use: This deterrent tool is equipped with an 800mAh rechargeable battery and provides a full charge in 40 minutes for about 2 hours of continuous work. The independent and large keys make it easy to use. Portable Design: The professional dog anti-barking device is sleek, ergonomically designed to provide a comfortable grip, and compact enough to fit easily in your pocket. It is easy to use both indoors and outdoors. Specifications: Structure: ABS Color: Black Battery: 800mAh Item Size: 12.3 * 5.2 * 2.7cm/4.84 * 2.05 * 1.06in Item Weight: 85g/3oz Package Size: 14.1 * 10 * 3cm/5.55 * 3.94 * 1.18in Package Weight: 123g/4.34oz Packing List: 1*Dog Barking Control Device 1*Charging Cable 1*Lanyard 1*Manual