Convenient wireless design: No need to bury wires, saving time and effort. The transmitter can be adjusted to 8 levels of intensity, you can find the level suitable for your dog. 4-level 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 restricted activities or getting lost. Adjustable collar and IP68 waterproof receiver: The belt is adjustable from 8 to 25 inches, suitable for all types of dogs weighing between 10 and 120 pounds. The receiver has IP68 waterproof function, allowing your dog to enjoy swimming, showering and playing in the rain. Rechargeable collar: The transmitter and receiver have built-in rechargeable batteries, no need to replace frequently, convenient to use and long service life. Multiple Receiver Support: These devices support multiple collars, so you can purchase additional collars and add them to your system.