Along the back are five 3.5mm jacks, while three USB-C ports sit in front, next to a sync button. On the top are a round Bluetooth key and a square button for toggling through up to three profiles.

The 2-inch-square button's hardware is customizable; Microsoft offers first-party toppers including a D-pad, a joystick, and an overlay that turns it into a dual button, but you can 3D-print your ...