Hi Adrian, in fact both work for me with MX Flow. However, my experience so far after a few weeks has shown that Flow works more stably via LOGITECH Unifying Receiver than via Bluetooth. Specifically, I had connected a notebook via LOGITECH Unifying Receiver on channel 1 and a second notebook via Bluetooth on channel 2. The Bluetooth connection was not stable at all and had to be "repaired" once a day under Windows 10 and then it worked again. Since I have been using a LOGITECH Unifying Receiver via USB on both computers and have reconnected/paired both with the MX900, Flow works quite well. But it can still be a bit sluggish and you have to fiddle around with the mouse until it's on the screen where you want it to be and the keyboard usually follows 2-3 seconds later. But you have to configure it explicitly in the Logitech Options software so that you want to drag the keyboard along. Hope this helps. Meanwhile