Heath Zenith Wireless Motion Sensor with Light, Specifications: 120 deg Detection Angle, 12 ft Detection Range, Surface-Mount, Plastic, Black, Dimensions: 3.94 in H x 3.91 in W x 3.07 in D, Suitable for: Heath Zenith Wireless Doorbell Chime and Heath Zenith Smart Wireless Doorbell Chimes, Includes: (2) Wall Anchors, (2) Large Screws and (1) Small Screw