Features: The dog training collar receiver is compatible with wireless electric dog fence system only(HT-023). Supports 2 warning ways (beep & shock) to train your dog to stay in specified and safe area. The receiver is powered by one 6V 4LR44 battery(battery is included). The indicator light on the receiver will turn red when the battery is running down and needs to be replaced. Collar strap is about 60cm long, which is compatible with most dogs. Specifications: Color: Black Material: ABS Strap Length: about 60cm Receiver Size: 6.5 * 4 * 3.2cm/ 2.6 * 1.6 * 1.3in Item Weight: 57g/ 2oz Packing List: 1 * Dog Collar with Receiver