This 3-in-1 ultrasonic dog bark deterrent combines a bark collar alternative, whistle, and training tool in one. With one press, it helps stop barking, chewing, or diggingno shocks, just safe and humane guidance. Featuring 3 modes (ultrasonic, sound, ultrasonic + flashlight) effective up to 50ft, it works best with positive reinforcement. Most dogs respond well, though some may need extra training. More than a bark deterrent, it doubles as a flashlight for daily use. USB-C rechargeable in 2.5 hours, pocket-sized, lightweight, and with lock modeready to go anywhere.