Although we featured the world's first exclusively solar-powered computer mouse as long ago as 2007, I think it's fair to say that such solutions haven't exactly taken off. One reason could be a fear of being left unable to click and scroll if there's not enough light to juice up the I/O peripheral. Bondidea's N91 wireless optical mouse gets round any potential power fail anxiety by running from either battery or the built-in PV panel.
On the face of it, putting a photovoltaic panel on top of a computer mouse might seem like a bit of a strange idea, given that your hand will probably block out all light when in use. For much of the time, though, a mouse will likely just be sitting idly next to a keyboard or laptop, waiting for someone to handle it. So, it might as well soak up some power-giving light while it's there.
The N91 from Bondidea sports just such a top-mounted panel, which juices up a built-in rechargeable battery. There's also a battery compartment for an AAA-sized alkaline battery underneath and, although the mouse can run on solar power only, it is recommended that users install the second battery to ensure continuous operation. The battery compartment can also house a gold-plated USB nano receiver while on the move, with the peripheral using 2.4GHz anti-interference wireless technology.
In addition to left and right click buttons and scroll wheel, the N91 also has a DPI button on top. This alternates the AVAGO high speed laser optics between 1000 DPI for standard use and 1600 DPI for precision positioning.