Material:Acrylic+ABSBattery:CR2032 (for memory time when cut off power, not included, clock is powered by USB cable)Size:24*9*4cm (larger than other store's)Power supply :DC 5V 0.75WComprehensive settings:1.General setting:Long press "set" button to set "12/24H"-"Time"-"Year"-"Date"-"C/F" by "+" and "-" buttons .(tap"set" button to enter next setting)2. Brightness mode setting:Tap "+" button- "L-SL" four levels of automatic sensitivity in sleep mode ;"L-AU" three levels of automatic sensitivity ;"L-01" first  brightness ;"L-02" second brightness ;"L-03" third brightness ;turn off the display .such a cycle operation .3.Display mode setting:Long press "+" button to switch display mode: (1) Display Time Only    (2) Time,Date,Temperature Cycle DisplayAlarm settings:1.Tap "-" button to open/close alarm2.Long press "-" button to enter alarm setting3.Start snooze: rings ,tap any clock key to start snooze ,alarm indicator light flashes slowly4.Turn off the alarm:when the alarm clock rings ,long press any key to turn off alarm ,enter the next alarm state