The Portable Motion Sensor uses advanced technology to detect intruders and activity in a controlled area: 110° horizontal view, 20° vertical view up to 30 feet from unit. Completely self-contained and portable, the Portable Motion Sensor operates on 2 standard AA batteries. Can be mounted on a wall, floor or ceiling, or simply placed on a tabletop. Unit is armed and disarmed from up to 30 feet away with the handheld remote. Great for security or paranormal work when you want to monitor an area for activity.