High Tech Pet Electronic Pet Containment Systems Uses proprietary technology to automatically adjust stimulus intensity based on distance from boundary, keeping pet contained without overstimulation Progressive audible tones reinforce shock stimulus resulting in an even quicker, easier training process Ultra-slim waterproof collar features built-in battery and shock tester; collar also works with Radio Mat pet deterrent transmitter pad Waterproof transmitter, with all digital coded signal eliminates false triggers at the collar System includes transmitter, collar, 500-feet of Ultra Wire, 50 flags, 10 wire connectors, AC adapter, mounting hardware and 1 collar battery