Blendr is an elegant, integrated accessory-mounting solutionProvides clean and secure mount for Bontrager Ion headlightsWorks with any Blendr-compatible stem and the accompanying baseFor use with Blendr bases (Pro, XXX, XXX bar/stem and select Elite bases)Blendr works with this simple formula: Stem + Base + Mount. Add accessory.Please use the Bontrager/Trek Blendr compatability flowchart to ensure your selection of stem, base and mount are compatible..