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
New Usb Receiver Wireless Dongle Receiver USB Adapter for logitech mk270/mk260/mk220/mk345/mk240/m275/m210/m212/m150 Mouse Keybo
Pairing A Logitech MK270 Keyboard And Mouse To A Non Unifying Receiver. – wherethingsareborn
Logitech MK540 Advanced Wireless Keyboard and Mouse Combo for Windows, 2.4 GHz Unifying USB-Receiver, Multimedia Hotkeys, 3-Year Battery Life, for PC, Laptop - USB Wireless RF Keyboard - Black - USB Wireless
LOGITECH MK270 WIRELESS KEYBOARD & MOUSE COMBO | Lin Haw International