3.125"W x 4"D x 2.75"H, White, Replacement Motion Sensor With Dual Brite, Dualbrite Is A Patented Heath Zenith Technology That Provides Energy Saving 2 Level Lighting Operating At Half Power Until Motion Is Detected & Full Power Lighting When Motion Is Detected, Provides Soft Accent Lighting Beginning At Dusk, When Motion Is Detected, Light Automatically Switches To Full Bright Security Lighting For A Pre-Selected Amount Of Time, 1, 5, Or 10 Minutes, Light Will Then Automatically Return To Accent Mode, 50% Power, Accent Lighting Will Begin At Dusk & Can Be Pre-Selected To Stay On For 3 Hours, 6 Hours, Or Until Dawn. Up To 100' Detection Range, Selectable Light Timer, Test, 1 Minute, 5 Minute, Or 20 Minute, Adjustable Detection Sensitivity, Extends Bulb Life, Up To 4 Times Or Alert Flash, 270 Degrees, 10 Year Warranty.