DZT1968&reg; Sounds Control LED Electronic Desktop Digital Alarm Clock With Temperature Color:Show as picture Material : MDF + PVC;Size:147*78*70mm (LxWxH) The "VOICE" mode only available when you use the batteries, that is the "Power Saving" mode; It also works in voice mode. Make some noise (clap your hands, rap on the table or pat the clock) Dual Power Supply: DC 5V input or by battery (4 x AAA) not included Package Include:1 xAlarm Clock+1 x USB Cable