LOGITECH Cordless Desktop Wave Wireless Keyboard & Mouse - NO USB Receiver | eBay
Hands-On: My First Week With the Logitech Cordless Wave Keyboard and Mouse | WIRED
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