Designed with a precise signal transmitter and locator, this Reference Point Locator pinpoints the exact location to drill or cut through a wall, so no more guesswork. This tool features the following:

Easy to use: Place the transmitter into the wall and the receiver will draw you to the exact location of the transmitter from the other side. Then, simply mark the wall and drill the hole.
Accurate to within half an inch and can be used up to four feet away
Kit includes: transmitter, receiver, (2) 9V batteries, tack adhesive, instruction sheet, and carrying case