GING YHAU alarm clock large digital rotating base 2-level brightness digital clock bedroom bedside alarm clockGING YHAU alarm clock large digital rotary base, 2 level alarm sound, 2 level brightness digital clock bedroom, easy to read, bedside alarm clock, 12H format, socket power supply Product Description 1 Simply plug the power cord into a standard American 120V socket for AC 120V power. AAA backup batteries (excluding batteries) are located at the bottom of the clock to prevent power outages and do not require resetting time settings.