LBRNO 2014 Latest Underground Waterproof 2 Dogs Shock Collar Electric Dog Fence Fencing System Up to 5000M Remote Control Shock Training Collar The transmitter is sensitive to give the stimulation when the dog are approaching the boundary Quick Disconnect Terminals- quick and secure connection or disconnection of the wire to the control center Power Boost Switch- Allows the width of the warning are to be adjusted Nice,Unique,fashionable design,portable with light weight For all dogs with update version ,and most reliable.