Monitor movement around your house and keep your family prepared for visitors welcome or not with the powerful Skylink Wireless Security System Motion Sensor. The sensor s wide detection range allows monitoring of large areas such as your front/back yard or driveway. FEATURES: Protects your home by detecting movement inside your house. Monitors your front/back yard and driveway. Motion detecting range: 40 feet by 110 degree arc. Easy to set up. Low battery indication. CONTENTS: Sensor Battery Ball-head joint Installation screws. NOTE: Requires a Skylink Receiver to alert you.