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A wireless keyboard
Logitech's Wireless Solar Keyboard K760 is a light-powered wireless addition that you can charge with lamplight or sunlight, indoors and outdoors. On a full charge, the keyboard -- lit for use in the dark -- can work for at least three months, according to the manufacturers.
In addition, the easy-switch feature means that through a Bluetooth connection, you can flip between writing an email on your Mac, using an app on an iPad or replying to a text on your iPhone.
Logitech's keyboard costs $79.99.