Convenient wireless design: No need to bury cables, saving time and effort. The transmitter can be set to 8 intensities, so you can find the right level for your dog. 4 adjustable distance levels: There are 4 adjustable coverage levels. The range from the center of the transmitter is 50 m, 100 m, 150 m, 200 m. Your dog can play freely and safely without fear of being restricted or getting lost. ADJUSTABLE COLLAR & IP68 WATERPROOF RECEIVER: The leash is adjustable from 20 to 63 cm and is suitable for all dog types weighing between 4.5 and 54 kg. The receiver is IP68 waterproof, so your dog can swim, shower, and play in the rain. Rechargeable collar: The transmitter and receiver have built-in rechargeable batteries that don't need to be replaced frequently, are easy to use, and have a long lifespan. Supports multiple receivers: These devices support multiple collars, so you can purchase additional collars and add them to the system.