Logitech introduced "Wireless Solar Keyboard K750" that powers itself whenever there's light, even indoors, making battery hassles a thing of the past.
K750 offers Logitech Advanced 2.4 GHz wireless connectivity, keeping you connected with virtually no delays or dropouts, so you get all the benefits of a cord, with the convenience of wireless. Logitech Advanced 2.4 wireless also includes 128-bit AES encryption with keyboard -- one of the highest levels of security available.
Plus, the tiny Logitech Unifying receiver is small enough to stay in your laptop, so there's no need to unplug it when you move around. And you can easily add up to six Logitech Unifying and Unifying-ready mice and keyboards -- without the hassle of multiple USB receivers.
Included solar power app features a lux meter to help you get the necessary light, makes it easy to get at-a-glance info about battery levels, and even alerts you when you need more power.
Reference: Press Release