【USB Rechargeable】: Equipped with USB charging cable, charging for 2 hours can be used for 20 days. 【Waterproof】: The collar is IP67 water resistant, it is made of excellent waterproof material. This allows your dog to swim freely with the collar on. It also means that you can train your dog in any weather condition. 【Smart Bark Detection】:The particular trigger sensor will detect dog barking (barking frequencies: 1000-2000kHZ, 80-90db) more accurately and faster, which can effectively and safely filter out other unrelated sounds and prevent false triggers . 【Suitable for All Dogs】: The adjustable nylon strap (4 to 20cm) allows the collar to fit small, medium and large dogs. The receiver weighs only 63g, making it comfortable and easy for dogs to carry.