Our iMounTEK GPS wireless dog fence combines fence function and tracker function. Once set up, if your dog approaches or crosses the boundary, the GPS receiver will beep for 20S, vibrate for 20S, give static shock for 20S and work by cycle until your dog backs into the established boundary. The GPS tracker also helps you locate your dog and allows you to follow the route on the e-map to find him or her. USB rechargeable, keeps standby for 72 hours after fully charged. IPX6 waterproof and suitable for dogs of all sizes and weights.