The Bontrager XXX Bar Stem Blendr Duo Base lets you add the Blendr XXX mounts to Bontrager XXX road handlebars & stems. The Duo base means that you can add two separate mounts to your Blendr system, so you can have a computer & light, or light & camera mounted to your stem at the same time. There is also a Mono base available with a single mounting point. Features Blendr works with this simple formula: Stem + Base + Mount. Add accessory. Bases for use with the XXX Integrated Road Handlebar/ Stem Add any accessory mount (sold separately) for an elegant, integrated look