Low profile and brilliant bass dome. Cut through traffic noise and make yourself known on the road while protecting yourself from the risk of auto and pedestrian accidents. Features - Classic brass sound - Low-profile design with brilliant brass dome - Adjustable rotating thumb spring trigger for ambidextrous use - Quick Assembly: Tool-free - easily mounts to any bar from 22.2 - 36.2 mm - Brass dome with adjustable rubber strap - Weight: 0.08 lb / 34g