As a new addition to the popular Oi series, the Oi Prima is equipped with the new "WAVETEK" hammer technology. The revised hammer design ensures a more even tone and a slightly higher volume of 80 decibels. The Oi Prima fits most handlebars on the market. Simply slip it over the handlebar, tighten the hex screw, and you're ready to go. A practical cable management system is integrated into the mount. Lightweight, discreet, and space-saving.