Designed to look great and provide a necessary function, this touchless door sensor operates using reflected infrared light. It activates a door (or other relay) when you wave your hand in front of it. Sealed construction, safe for outdoor use Detection distance: 1.2″ to 3.9″ (3cm to 10cm) Adjustable range and sensitivity Encoded signals prevent interference from nearby radiant IR light sources. Bicolor LED indicates activity/standby Power: 12VDC @ 25mA max. during activation (15mA during standby) Can be used with or without included mounting plate Dimensions: Sensor: .98″ x 1.4″ (23mm x 35mm) Mounting plate: 1.5″ x 4.5″ (38.1mm x 114.3mm)