Specifications: Features in details: Clock supports 12-hour and 24-hour time format; Temperature is adjustable between Celsius and Fahrenheit; You can choose 8 different alarm songs. Great gift for kids Power supply: Clocks display powered only by 2xAG13 batteries. LED light can be powered by 4xAAA batteries or by USB cable from any device, or by USB cable with power adapter from DC. Unfortunately batteries, USB cable and power adapter are not supplied by manufacturer. So as BONUS we are sending: 2xAG13 batteries and USB cable. We can't send 4xAAA batteries because of custom checks and power adapter because it can't be fit it in original box. Note: If on received clock display is not working - just check polarization of 2AG13 batteries and if problem will not solved, please contact us directly via message center. If you will use LED lights during whole nights, we are suggesting you to use USB cable, and if you will use only demo mode which allows LED lights for little time, you can use 4xAAA batteries. Dimension and Weight: Product weight: 0.160 KG Package weight: 0.180 KG Product size (L x W x H): 8 x 8 x 8 cm / 3.15 x 3.15 x 3.15 inches Package size (L x W x H): 8.4 x 8.4 x 8.4 cm / 3.307 x 3.307 x 3.307 inches Package Contents: 1 x original package, 1 x Cube Clock, 1 x Manual, BONUS – USB cable and 2 x AG13 batteries