Two display modes: Press button set for 1 second to transform dp-1 to dp-2 or dp-2 to dp-1. And dp-1 means LED screen automatically conversion time, date, temperature and dp-2 means LED screen display time all the time.Very flexible. Sound control functionPress button DOWN for 1 second to transform on:Sd to - -:Sd or - -:Sd to on:Sd, and on:Sd means after 30s no any press, LED display automatically closed, and - -:Sd means LED screen display all the time.This is useful for power saving and sleeping well. Adjustable brightness and 12/24 hour formatPress button UP for 3 seconds and it display L1, then adjust the luminance by button DOWN to darken and UP to brighten.There are three display luminance adjustments and darken from L1 to L3. Press button UP for 1 seconds to transform to or to . 3 ALARMS: After setting time and date by pressing button SET for 3 seconds, you can continue to set alarm clock. There are 3 separate wake-up time to remind you the important dates or appointments. Please note we dont recommend to use batteries for workingbecause the LED light consume power very quickly. Batteries can only last 1-2 days whenworking. Once batteries are running off, the digits willappear to be faded because batteries voltage is not that enough to hold its normalworking.Batteries are only used for temporary short time or f o r travel use.When using this product, it is better to use powercord to work.