Replacing Battery in the Logitech Wireless Solar Keyboard K750 (How To) - YouTube
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Amazon.com: Logitech K750 Wireless Solar Keyboard : Electronics
Logitech's K750 Keyboard is solar-powered and just $27 shipped (Refurb, Orig. $60)
Logitech K750 Wireless Solar Keyboard for Windows, 2.4GHz Wireless with USB Unifying Receiver, Ultra-Thin, Compatible with PC, Laptop - Black - Newegg.com