Convenient Wireless Design: No need to bury wires, time-saving and hassle-free. The transmitter can be adjusted to 8 intensities, you can find the right level for your dog. 4 Level Adjustable Distance: There are 4 levels of adjustable coverage. The radius from the center of transmitter is 50m, 100m, 150m, 200m. Your dog can play freely and safely without worrying about restricted movement or getting lost. Adjustable Collar and IP68 Waterproof Receiver: the belt can be adjusted from 8 to 25 inches, suitable for all types of dogs weighing between 10 and 120 pounds. And the receiver is IP68 waterproof, let your dog enjoy swimming, showering and playing in the rain. Rechargeable Collar: With built-in rechargeable battery for transmitter and receiver, it doesn't need to be replaced frequently and is easy to use with a long lifespan. Supports Multiple Receivers: These devices support multiple collars, so you can purchase additional collars and add them to the system.