Convenient Wireless Design: No need to bury cables, time-saving and hassle-free. The transmitter can be adjusted to 8 intensities, you can find the right level for your dog. 4 Levels Adjustable Distance: There are 4 levels of adjustable coverage. The radius from the center of the transmitter is 50m, 100m, 150m, 200m. Your dog can play freely and safely without worrying about limited 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 a built-in rechargeable battery for the transmitter and receiver, it does not need to be replaced frequently and is easy to use with a long service life. Supports Multiple Receivers: These devices support many collars, you can buy additional collars and add them to the system.