High Tech Pet - Humane Contain HC-8000Plus Super Electronic Dog Fence with Free Extra Collar Includes: 2 RC-8 radio collars Base station transmitter 500' of Ultra-Wire 50 boundary flags 10 waterproof wire splices 2 radio collar batteries AC adapter Complete installation and training instructions Pulsed Proportional Stimulus: Applies shock in rapid pulses Continuously increases the pulse rate as your dog approaches the boundary Lets your dog decide how much stimulus it takes to retreat Radio Collar: Fully waterproof Built-in stimulus tester Built-in battery indicator Ultra-tough poly-elastomer strap, adjustable to 25" Louder tone speaker Ultra lightweight Ultra comfortable on your dog For all dogs 5 lbs. and up Base Station Transmitter: Illuminated system status panel Audible and visual wire brake alarms Power boost Water sealed and outdoor mountable Heavy-Duty Wire: Engineered specially for electronic dog containment systems Solid-core copper Thick, strong insulation Resists ultraviolet rays, moisture, ground rot About 3 times stronger than heavy-duty 18-gauge wire