Tensioning screw mutes bell if screwed in past a certain point. Unfortunately for the narrower handlebars of my road bike, that point was too loose and I had to wrap padding between the bell and bar to fit without muffling. Bell still doesn't ring reliably and sometimes gets muffled by something inside. Compass doesn't work. They should have used a floating ball compass. Trigger for bell is much longer than mechanically necessary, reducing handlebar real estate. I actually cut back the trigger plastic with snips and it's a much better fit, but I would avoid this product if had it to do over.