Logitech's Craft keyboard offers premium typing with big bonuses | TechCrunch
Logitech Unifying receiver - Wikipedia
Logitech Craft review: This $200 keyboard can do two things its competitors can't | PCWorld
Amazon.com: Logitech 920003051 K270 Wireless Keyboard, USB Unifying Receiver, Black : Electronics
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics