Convenient wireless design: no need to bury wires, saving time and effort. The transmitter offers 8 intensity levels, allowing you to choose the appropriate setting for your dog. 4-level distance adjustment: provides four coverage ranges with a radius of 50m, 100m, 150m, and 200m from the center of the transmitter. This allows your dog freedom to move safely within a secure boundary. Adjustable collar and IP68 waterproof receiver: the collar strap adjusts from 8 to 25 inches, fitting dogs weighing between 10 and 120 pounds. The receiver is IP68 waterproof, enabling use during swimming, bathing, or rainy conditions. Rechargeable collar: both transmitter and receiver feature built-in rechargeable batteries, reducing the need for frequent replacements and offering long-term, convenient use. Supports multiple receivers: compatible with additional collars, allowing you to expand the system for multiple dogs.