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, QWERTY UK English Layout - Black - PC Maestro
Unifying USB Wireless Receiver for Logitech Mice 570 T620 MX master M9 – Magconn
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
Logitech K270 Wireless Keyboard, USB Unifying Receiver, Black LOG920003051
Logitech USB Unifying Receiver Dongle for Mouse & Keyboard 910-005235 (5 Pack) - Walmart.com
Logitech MK470 Slim Wireless Keyboard and Mouse Combo - Modern Compact Layout, Ultra Quiet, 2.4 GHz USB Receiver, Plug n' Play Connectivity, Compatible with Windows - Graphite
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
Logitech MK235 Keyboard and Mouse Combo - Wireless Receiver, 15 Function Key Keyboard, 2x AAA Battery (Keyboard), 1x AAA Battery (Mouse), 2.4 GHz - 920-007897 at TigerDirect.com