Voberry USB AAA Powered Rectangle Shaped Voice Control Blue Light Digital LED Wooden Desk Alarm Clock with Date Temperature (Blue) Size:147*39*70mm (LxWxH) Material : MDF + PVC Displaying tempeterature , C/F displaying of thermometer The "VOICE" mode only available when you use the batteries, that is the "Power Saving" mode Dual Power Supply: DC 6V input or by battery (4 x AAA) not included