Humane Contain Electronic Dog Fence and Pro Trainer Plus Sonic Obedience Trainer combination kit, combines the state-of-the art, model HC-8000 ultra dog fence with non-shock, model PT-2 multi-command trainer in one super value kit. Note that the sonic trainer does not trigger stimulus at the dog's containment collar. It is a separate hand-held unit that emits high pitched training tones for painless obedience training. Electronic fence features proprietary Pulsed Proportional Stimulus System that delivers shock stimulus in quick, bursts which come faster as your dog moves closer to the boundary. Lets your dog decide for himself how much stimulus it takes to retreat. Progressive, audible tones reinforce shock stimulus for even quicker, easier training. Includes TX-1 transmitter with illuminated system status panel, visual and audible cable break alarms, field width control. Transmitter also accepts optional self-recharging back-up battery (sold separately). Ultra-light RC-8 radio collar is among the smallest radio collars made. It's fully waterproof with long life battery circuitry, extra loud training tone speaker, built-in stimulus and battery tester and solid copper probes. The Pro Trainer Plus produces three positive behavioral tones which you associate with specific commands such as Come, Sit and Heel. A negative tone is also provided to stop unwanted behavior and to break bad habits such as barking, digging, jumping and chewing.