Electric Dog Training Collar WATERPROOF Feature: With 7-level sensitivity adjustment, this is an effective do behavior modification tool that will help you train your dog to bark less. It can be easily charged za via USB cable. It is thinner, lighter and comfortable for dogs. No matter if your dog is small or large, our adjustable dog bark collar do them perfectly. The collar is waterproof, don't worry to use it even on a rainy day. Specification: Material: plastic nylon Size: about 6,7 * 4 * 3 cm / 2,64 * 1,57 * 1,18 inch Battery: Built-in 300mA lithium battery Charging method: USB charging Diameter adjustment range: 6-36 cm Voltage: DC 5 V. Animal size: all sizes Weight: 78g Color: Blue List of packages: 1 * Dog collar 1*USB Cable 1 * Instructions If the dog's coat is too long, it is recommended to cut it briefly to avoid affecting the vibration of the product.