AC plug; includes button battery backup for time and alarm settings.
This is the projection alarm clock named The Best by The Hammacher Schlemmer Institute for ranking highest in nearly every category evaluated.It also organizes and charges devices with a wireless charging dock for Qi-enabled phones, a wired charging dock for ear buds, a smartwatch stand, USB-A, and USB-C charging ports.) The easiest clock to set up, it can be customized to one of five display options (indoor temperature/ humidity, outdoor temperature/humidity, alarm time and on/off status, day/ month/date, or scroll through all), four brightness settings, and its large backlit LCD panel can be programmed to dim automatically at preset times..