Happy Henhouse Shurlock Automatic Chicken Coop Door Opener Kit with Actuator | Light Sensor, Timer and Controller | 9" W x 12" T Opening | 110V or 12V Battery | Create a Safe Chicken Run
Amazon.com: Panasonic CR123A-12PK Lithium 3V Photo Lithium Battery, 0.67" Diameter x 1.36" H (17.0 mm x 34.5 mm), Black/Gold/Blue (Pack of 12) : Health & Household