I have an MX Keys wirelss keyboard, and Logitech Ergo M575 wireless trackball mouse, keyboard is backlit,and both devices have  bluetooth and are connected to a single Logitech Unifying Receiver. I got the unifying receiver becasue I never got one when I bought the mouse and the unifying receiver will connect to several more logitech devices if you have any. I have a usb C to C cable to charge the keyboard and the mouse is battery powered. These both work great and are in very good condition. I'm just selling because they I don't work from home as much and that's what these were bought for. Any questions feel free to ask. I'll ship out the same day if it's paid early enough and no later than the next day regardless. Thank you