What devices can I pair with my Logitech unifying receiver, other than a mouse and keyboard? - Quora
New Usb Receiver Wireless Dongle Receiver Usb Adapter For Logitech Mk270/mk260/mk220/mk345/mk240/m275/m210/m212/m150 Mouse Keybo - Mice & Keyboards Accessories - AliExpress
Replacement Unifying Receiver for Logitech Wireless Combo MK270 Sh | eBay
Logitech Wireless Keyboard and Mouse Combo MK270 - 2.4GHz, Unifying Nano Receiver, Extended Battery Life