General description The Pet Dog Anti-Barking Electric Ultrasonic Vibration Automatic Training Collar is designed to help modify your dog's barking behavior effectively. Utilizing ultrasonic technology, this collar emits sound waves that are inaudible to humans but can effectively deter barking. It features both ultrasonic and vibration functions, making it a versatile training tool suitable for dogs of all sizes. Technical specifications Color: Blue Material: ABS + nylon Rechargeable via USB Waterproof design Adjustable fit for small to large dogs Measurement allowed error: +/- 1-3 cm Usage The collar automatically activates when barking is detected. Ensure the probe is one finger's width away from the dog's neck for optimal effectiveness. Do not use the collar while the dog is sleeping, lying down, or unattended. For larger dogs with longer hair, trimming may be necessary to enhance product efficiency. Other information Package Contents: 1 * Bark stopper Note: Light reflection and