Wireless Dog Fence,The biggest remote-control radius is 120 yd (110 m). When the dog reaches the signal boundary, the collar will vibrate. If the dog continues to stay away from the transmitter, the collar will release a 2 second shock ( Adjust the shock intensity by turning the dial ). Training Collar,The system sends instructions in three modes, including electric shock, vibration, sound. Can be used to help correct barking, walking, leash training, sitting, aggression, and other behavioral obedience. NOT:Don't put the receiver collar on your dog when the system is tested. Your pet may receive an unintended correction. It is important that you reinforce training with your pet on a regular basis for 15-25 days before using this fence system. This is a Reliable and Safe Dog Invisible Fence System. It provides WiFi connection instead of wire connection that makes the installation much easier than before.