This is approximately 7 inches tall and 3 inches wide. The light changes 7 different colors and is powered by either 3AA batteries or USB cable (Provided).

For $4 more you can upgrade to a rechargeable light. This will save you money on batteries. Search under (Images rechargeable light) and add to cart.

The lights are not compatible with a branded brick (apple).

If you want a universal USB adapter look under (images USB adapter) they are $2 each. You can plug the light into a wall with this.