This is the wrist cuff that warns of a room invasion by nosy siblings. Two 2 1/2" diam. x 1/2" D motion sensors placed surreptitiously to avoid detection pick up the opening of a door, the approach to a treehouse ladder, or the ascent of a stairway, sending a wireless signal up to 100' away to the wrist cuff that alerts the wearer that infiltration is afoot. The wrist cuff has two separate displays that correspond to each sensor and flash red when either or both are triggered by remote movement, accompanied by an alarm sound or silence during stakeouts. Requires six AAA batteries. (3 oz.)