Dual Ultrasonic Emitters: Dog Bark Deterrent Device with two synchronized ultrasonic heads for 2× coverage to interrupt barking, nipping, and jumping. A humane, no-shock alternative to bark collars, more targeted than dog whistles. 3-in-1 Safe, Humane Modes: Anti barking device offers fixed ultrasonic, auto ultrasonic + strobe, and beep mode. Adapts to daily use or persistent barking without pain or stress—ideal for home training and neighbor noise control. Selectable Fixed Frequency: Anti Barking Device for Dogs lets you choose 22, 25, 27, or 29 kHz to reduce tune-out. Dial in the tone your dog responds to and switch anytime as needs change—effective across breeds and settings to limit habituation. Auto Ultrasonic + Strobe: Dog Bark Deterrent Device cycles 22–29 kHz while a flashing light reinforces the cue, interrupting barking. Effective for resistant dogs and noisy settings. Use brief bursts, train humanely, keep light from eyes. 35 FT Range + LED Flashlight: Anti Barking Device guides behavior up to 35 ft—ideal for home, yard, walks, and off-leash spots. Built-in LED boosts visibility & safety for evening walks & low-light training to spot hazards and stay in control. Compact & Portable: Ultra-light, pocket-friendly design slips into a bag, pocket, or hand. Ideal for walks, travel, parks, and public spaces—encourages calm behavior without bulk. Fast USB-C Charging, Long Life: Full recharge in 2 hours, up to 50 days per charge (standby). Reliable power for daily training. Charge via laptop, power bank, or adapter, USB-C cable included to keep it ready at home or on the go.