Rechargeable Anti-Bark Device, Waterproof Bark Collar, Bark Detector (Blue) Features: With 7-level sensitivity adjustment, it’s an effective behavior modification tool that you can use to help your dog teach you to bark less. Can be easily charged with the USB cable. It is more smaller, lighter and more convenient for dogs. It doesn’t matter if your dog is an all-around dog or a big dog, our Adjustable Anti-Bark Collar will fit them perfectly. The necklace is waterproof, you don’t have to use it even on rainy days. p> Specification: Condition: 100% Brand New < p>Material: Plastic + Nylon Size: about 6.7 x 4 x 3cm / 2.64 x 2.64cm 1.57 x 1.18inch Battery : Built-in 300mA lithium battery Charging method: USB charging Adjustable diameter range: 6-36cm Voltage: DC 5V Pet size: all sizes Weight: 78g Blue color Package List: 1 * Dog Training Collar. 1 * USB Cable 1 * Manual Note: If the dog’s hair is too long, it is recommended to cut it short so as not to affect the vibration of the