No shock, no vibration, no noise, won"t sense your dog"s skin or affect your dog"s hearing, our dog training device is 100percent harmless to dogs and humans. Two modes with a flashlight ultra-sonic dog whistle to stop barking, Deterrent mode: emits a higher intensity ultrasound while the flashlight flashes to drive the fierce dog away, Training mode: emits a lower intensity ultrasound to assist in daily dog training such as stop excessive barking, fighting, biting, and correct other unwanted behaviors, the flashlight also has a long-bright mode for walking your dog at night. Features: Safe Dog Control Device: Dog anti-barking devices emit an ultrasound of 25kHz, which exceeds the coverage of human hearing but can easily attract the dog"s attention without hurting your dog like a dog whistle. 3 Different Modes: Drive away stray dogs with sound, 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. Versatile Design: This also stops your pet"s bad behaviors such as fighting, biting, chasing, eating hazardous things, etc. Our upgraded dog trainer is an effective way without causing stress or injury to your dog. Long-Lasting Use: This anti-barking deterrent is equipped with an 800mAh rechargeable battery and provides full charge in 1-2 hours for about 30 days of standby time. The large clear keys make it easy to use. Portable Design: The dog anti-barking device is sleek with a lanyard, 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: Color: Silver, Black (Optional) Material: ABS Battery: 1000mAh Item Size:12.09*5.38cm/ 4.76 * 2.12in Package Size: 14.2 * 9.5 * 4.1cm/5.59 * 3.74 * 1.61in Package Weight: 141g/4.97oz Packing List: 1*Dog Barking Control Device 1*USB Cable 1*Lanyard 1*Manual