Handlebar-Mount Volume Controller
The Boss Audio BVC10 universal volume control works with any smartphone or personal stereo with 3.5mm in/out. Specially contoured for handlebars, the glove-friendly BVC10 measures 1-1/2"H x 1-3/4"W x 1-1/2"D (2-1/8" to end of knob) x 14"L (to end of cables) and weighs just 0.36 lbs. It easily fits 1" handlebars but can snugly accommodate 1-1/4" bars.
Boss Audio asserts that the BVC10 is "Fully Marinized": "Fully Marinized is the term we use for our Marine and Outdoor products that are Weather Proof. We integrate high-tech, state-of-the-art waterproofing materials plus special UV coatings for plastic surfaces, coated circuit boards and connections to protect the product against the harsh outdoor elements and resist corrosion."