A:AnswerThe keyboard and mouse are independent of each other. So as long as you have an usb port for both your mouse and keyboard (which you should have plus a few extra), yes. This mouse will work with your K520 wireless keyboard, and any other keyboard you may purchase in the future.
A:AnswerHello, no this mouse strictly only works off the USB receiver. Here is a list of our Bluetooth mice for iPad: https://www.logitech.com/en-us/mice?filters=3882,4117.
-Danielle from Logitech
A:AnswerHello Dinesh. The M310 uses a USB type A wireless receiver. It will work with your MacBook Air as long as you have an available USB-A port. If your computer only has Type C ports, you will need an adapter.
A:AnswerI just tried to see how far it worked. I have my laptop on my kitchen table, and went to the kitchen counter using this mouse about 12 feet or more, and it worked. I didn't bother backing up any more then that, but I'm sure it would have worked as well. Great mouse!