Ensure your backyard chickens get in and out of their coop on time using the Nestera Chicken Guard Automatic Coop Door Opener. This automatic door opener's rectangular, box shaped body is constructed of sturdy, weatherproof plastic, and has a generous LCD screen for visiblity and easy programming. Its face features three large, blue buttons for powering on and off and navigating the device's settings, and above is a 2.5" long display of timer options. Underneath the face of the device is a USB port for connecting the opener to an external power source as an alternative to using the included, 4 AA batteries. Four included metal screws keep the gray opener firmly attached to your coop, and the high-grade electronics within the piece make for easy programming and operation. The string that attaches to your coop's pie-shaped door exits through a small opening on the device's underside for protection from the elements. This opener features a programmable timer and light sensor for automatic opening and closing according to sunrise and sunset, and can automatically stop if it feels an obstruction during closing, keeping your hens safe. This device is compatible with any Nestera chicken coop with metal, pie-shaped doors and is designed to function all-year round. Gain more time for yourself in the mornings using this Chicken Guard Automatic Coop Door Opener. Some assembly required. Three year warranty.