Large LED DisplayOur alarm clock features a 5.6-inch large LED mirror display making it easy to read, one of the best alarm clocks for bedrooms due to its simplicity, this premium digital clock is something you enjoy waking up to every morning. USB Powered and Built-in Backup Battery already include a charging USB cable for our smart clock for your convenience for powering, A built-in button battery for saving your clock settings in case of power outages, and Time display support for both 12hrs and 24-hour format.