This lightweight unit can be placed on any surface that you do not want your pet to jump on. It can be placed on furniture, display cabinets, kitchen units or even hung on a door or window with its adjustable strap. As the unit is activated by motion it means that the moment your dog or cat jumps onto the forbidden zone it activates automatically. You choose between the high or low sensitivity switch and can also choose ultrasonic (inaudible to humans) or both ultrasonic and audible to alert you to your pet’s transgression. Training instructions are included on the packaging. Operates on a 9V battery, not included.