ChickenGuard Premium Automatic Chicken Coop Door Opener & Self Locking Door Kit, Opens & Closes Your Chicken Coop UsingA Timer &/Or Light Sensor, Adjustable Light Sensor, Configurable Fail Safe Timer For Light LUX Sensor, Fully Featured LCD Display For Ease Of Use, Uses 4 "AA" Batteries, Included, Or Electric Powered Via USB, Cables Not Included, Low Battery Warning, Door Closed Indicator Visible Up To 100 Yards Away, No Minimum Or Maximum Door Heights, No Complicated Wiring Or Cabling, Helps Prevent Predators Claws From Lifting The Coop Door, Innovative Self Locking Mechanism & Wings, Tough& Durable 100% Recycled Runners, , All In 1 Design, 3 Year Manufacturer Warranty.