USB Rechargeable: Simply plug in via USB to charge for convenient use. Ultrasonic Technology: The collar emits ultrasonic waves that are inaudible to humans but help reduce barking. Automatic Activation: The collar automatically activates when barking is detected, providing hands-free operation for effective training. Vibration Function: Includes a vibration mode as an alternative to ultrasonic sound, offering a versatile approach to behavior modification. Comfortable Design: Lightweight and compact, designed for comfort on small to large dogs. Adjustable fit ensures a secure and proper fit. Waterproof Construction: Designed to withstand water exposure, suitable for use in various weather conditions. For dogs with long hair, trimming the fur around the neck area may improve contact and performance. Do not use the collar while the dog is sleeping, lying down, or unattended. Ensure proper fit by placing one finger between the dog’s neck and the probe. Color: Blue Material: ABS + Nylon Package Contents: 1 x Bark Stopper Note: Light reflection and display settings may cause slight color variations. Measurement may vary by +/- 1-3 cm.