Wow, talking about innovation, I was surprise they make keyboard that charges the battery with solar power, so basically you have either a battery built-in rechargeable that is or a AA or AAA size battery again rechargeable, what it does is the solar panel in front of the keyboard will charge the battery when needed,  or I guess use it simultaneously with just normal room light, doesn’t have to be sunlight, cool huh?

I found one, on sale right now. It’s a Logitech “Logitech K750 Wireless Solar Keyboard”

The K750 Wireless Solar Keyboard from Logitech is a solar-powered keyboard that features wireless connectivity and compatibility with Windows-based PCs. It charges automatically when exposed to the light, and holds a charge of up to 3 months. It features environmentally-friendly construction, an unobtrusive USB receiver and slim profile. Since it is hot pluggable, it works right out of the box without any software installation. The K750 keyboard is a smart choice to save the environment while enjoying a comfortable and productive computing experience.

Solar-Powered
Whenever there’s light, the K750 keyboard charges itself and stays charged for at least three (3) months in total darkness. While it allows you to use less energy it also reduces battery hassles.
Wireless Connection
An advanced 2.4 GHz wireless connection means you can work and play in more places. The long-range wireless connection reduces delays, dropouts, and interference.
Minimal Environmental Footprint
This keyboard features PVC-free construction and a fully recyclable box to minimize its footprint. Additionally, the Logitech Solar App lets you keep track of how much battery power you have and how much power you’re getting from your desk lamp.
Plug-and-Play
Simple Plug-and-Play functionality means setup takes a few seconds when you plug the wireless receiver into a USB port on your computer. You can start using the keyboard right away without installing any software.
Unobtrusive USB Receiver
The small receiver stays in your computer, and you can even add a compatible wireless mouse of keyboard without the need for multiple USB receivers.
Slim Profile
The K750 features sleek lines and a slim profile at just 1/3″ thick. It affords you extra workspace while lending a streamlined presence on your desk.
Comfortable Design
Keys feel good and make each keystroke comfortable, fluid and quiet for a productive everyday typing experience.