The "Tattle Tale" uses structural vibration technology to detect vibration in any object or surface. Ideal to keep pets off furniture, beds, garbage cans, etc. Prevents scratching, clawing and climbing. Also ideal to protect doors, windows, gates, and cabinets from intruders. Once triggered, it sets off a distinct 3-second alarm, then automatically resets. High/Low sensitivity switch. Long Life continuous operation on a standard 9V battery (not included). Works in any position. Sold in case lots of 72 units. 18 lbs/case. MSRP $29.99. TD790