Simply plug this clock in and watch in wonder as it sets itself automatically! It even sets itself after power failures and daylight-saving time so it always displays the right time. Extra-large 2" LED display and dual alarm with volume control, high and low display dimmer, snooze button and time zone switch. Battery back-up. Requires 1 button cell battery (included FREE). ETL® Listed. 8-1/4"x4".