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 and 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 or 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 and 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 or Current : 5V or 2A(DC) Working sound wave: 25KHz-40KHz Product Dimensions: 4.3x1.2x1.2inches 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