Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics
Logitech K350 Wireless Wave Keyboard with Palm Rest
Logitech K350 Black Wave Unifying Wireless Keyboard NO USB RECEIVER DONGLE | eBay
Logitech K350 Wireless Wave Keyboard with Unifying Wireless Technology - Black (Open Box) | The Hacker News
Amazon.com: Logitech USB 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
User manual Logitech K350 (English - 40 pages)
Amazon.com: Logitech K350 Wave Ergonomic Keyboard with Unifying Wireless Technology - Black : Electronics