

Apparently according to other comments a mouse only works in games, but not in Switch UI menus. The Joycon works as a mouse in both.
I would think a wireless mouse and a wired mouse are functionally the same as far as the device connected to it is concerned. The USB dongle of the wireless mouse handles the wireless part and then delivers the same type of signals to the PC/host device that a wired mouse would.
Fair. That’s got me wondering, perhaps if you’re in a game with Joycon mouse support it might lock into mouse mode. One thing that annoys me about using a Joycon as a mouse is that you have to have it on a horizontal surface - I like using a mouse on all sorts of weird things and at different angles (eg curved sofa arms or my belly) and the Joycon doesn’t work for this in UI menus.