Ultrasonic Dog Repeller Anti Bark Device Stop Barking Humane Pet Training Tool Features: 【Handheld Ultrasonic Dog Trainer】A professional tool for training and bark control, emitting safe sound waves (25-40KHz) to attract dogs' attention and prevent unwanted behaviors. Adjustable sound waves repel aggressive dogs, making cruel shock collars unnecessary. 【Portable & Effective Range】Compact size for easy portability, one button operation can drive dogs with a 30-foot range for effective bark prevention. 【Long Battery Life】800mah Rechargeable Li-ion battery offers up to 60 days of use per charge, ideal for travel and outdoor activities. 【Unique Dual Frequency Modes】Low/high-frequency modes for training and immediate behavior correction. 【LED Lighting Design】Two high brightness LED lights, one click to turn on spotlight lighting, walking in the dark, safe and worry free! Working Principle: The ultrasonic dog repeller emits 25KHz waves (audible to dogs 15Hz-50KHz),  which don't harm but deter barking and aggressive dogs.Target Audience: Effective for large, fierce,  and domestic dogs over 6 months. Less effective for puppies <6 months, seniors >8 years, or pets due to reduced hearing sensitivity. Applicable Distance: Max 30 ft, best at 18 ft. with no obstacles, as ultrasonic waves can't bypass barriers. Applicable Environment: Works best in quiet settings. Noise from cars, busy streets, or loud speakers can interfere. Safe & Humane: An alternative to shock collars, using ultrasonic technology for gentle, non-harmful correction. Usage: Aim at the dog, press, and hold the ultrasonic button. Switch gears if needed. Specification: Color: Orange Power Source: Battery Powered Controller Type： Button Control Material: Plastic Input Voltage/Current : 5V/2A(DC) Working sound wave: 25KHz-40KHz Product Dimensions: 4.3*1.2*1.2inches Recommended Uses For Product: Dog training, stopping barking, chasing away vicious dogs Package Includes: 1 x Ultrasonic Dog Repeller 1 x User Manual 1 x USB-C Cable