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. Ultrasound and flashing light, the set ultra-sonic frequency (25-30kHz) has a certain effect on dogs and helps you correct their behavior. Or LED strobe mode to deter your dog. Our bark control device can be quickly recharged in 2 hours using any standard USB device and will last for approximately 60 days of standby time. It"s perfect for short trips and outside activities without worrying about running out of power or having nowhere to charge. Features: Safe Dog Control Device: Dog anti-barking devices emit an ultrasound of 25-30kHz, 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 flashing LED lights, 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 ultra-sonic trainer is an effective way without causing stress or injury to your dog. Long-Lasting Use: This anti-barking deterrent is equipped with a 1000mAh rechargeable battery and provides full charge in 2 hours for about 60 days of standby time. The independent and clear keys make it easy to use. Portable Design: The upgraded 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: Material: ABS Color: Black Battery: 1000mAh Item Size: 11.6 * 5.3 * 4cm/4.57 * 2.09 * 1.57in Package Size: 15 * 10 * 4cm/5.91 * 3.94 * 1.57in Package Weight: 131g/4.62oz Packing List: 1*Dog Barking Control Device 1*Charging Cable 1*Lanyard 1*Manual