5440100 Features: -Bark limiter. -Exclusive Bark Odometer counts the number of times your dog barks so you can determine its effectiveness. -Internal bark sensor activated by vocal cords prevents false stimulations caused by bumping the product against something. -Consistent and dependable so that your dog receives the same stimulation each and every time. -Waterproof, lightweight and designed for a comfortable and correct fit. -Easy to see on/off and stimulation level indicator light. -Interchangeable long and short contact points for different coat thicknesses. -Stainless steel contact points minimize neck irritation on the dog. -Built-in sleep mode extends battery life to approximately one year with normal use. -Non-rechargeable, user replaceable, 3-volt lithium battery included in product. -30 Day money back guarantee. -1 Year comprehensive warranty.