Prompt The battery can only be used normally for 1-3 days. We usually recommend using USB. Description: 3 x AAA Batteries (Batteries are not included) Adaptor Input / Battery Type: 1pc USB power supply cable Material: Wooden frame with graining coat Dimension: 60 x 60 x 60 mm (L x W x H) Quantity: 1 pc Package Includes: 1 X USB cable 1 X LED wooden clock 1 X User manual Features: Alarm function. Powered by USB power supply cable or 3 x AAA batteries.Buttons operation: UP, DOWN and SET It has LED display of time and temperature alternately. Up: To change the time in settings mode. in normal mode to change temperature Format Time display 12-hour or 24-hour mode This designer LED digital alarm clock is made of imitation wood and its face is enclosed inside the wood. It also works in voice mode. Make some noise (clap your hands, rap on the table or pat the clock) nearby can wake it up. Down: Sound Activated switch Note : If the power supply is switched on,but it does not work, please press "reset" button