Fantastic volume pedal. Replaced a full sized (enourmous) Dunlop volume pedal. Similar size to a standard BOSS pedal. I prefer the travel on this for swells. At first I thought the AUX output wasn't working until I discovered you need to flip and internal dipswitch (by unscrewing the bottom panel) to choose between using the AUX jack as an expression pedal or as a tuner output. That said, it's safe not to accidentally switch back!