Solar-Powered Keyboard: No Battery Hassles - Any Light Source Keeps Your Keyboard Charged For At Least Three Months In Total Darkness Only 1/3-Inch Thick: Ultra-Thin Design Adds Sleek Style To Your Workspace Familiar Mac Layout: All The Keys You're Used To, Plus A Launchpad Hot Key, Are Exactly Where You Expect Them Feel-good typing: Logitech-only concave key cap design for faster, quieter, more comfortable typing Tiny Logitech Unifying receiver: Stays in your laptop and connects additional compatible wireless devices