These cubes run on rechargeable batteries.They come with a 100-240V (input)/ 5V 1000mA (output) charging adapter.The cubes needs to be charged for an estimated time (until the light turns green on the adapter) and can be used via a battery powered remote (also included). Specifications: Size: 8" cu. LED Colors: Red, Blue & Green Weight: 3.75 lbs Modes: Slow color change, still red, still green, still blue, still yellow, still white, still pink, still purple, color change