Solar panel on a keyboard? Sure, that sounds too much but actually its a very good idea. Just think, with a solar panel on you'll never need to replace batteries. And with the advent of indoor lighting, I am sure it can store sufficient amount of energy to drive the keyboard. The integrated solar panel is adjustable, so that you can position it properly to get maximum "indoor" light energy. The keyboard is powered by 2.4GHz radio frequency technology and offers 17 hot keys. The solar panel keyboard will be available in the Japanese market by month end for approx $128.