SUPPORTED GARMIN COMPUTERS: GARMIN EDGE® 1030*, 1000*, 820, 810*, 800*, 510, 520, 500, 200, 25, 20. ALSO SUPPORTS THE TOURING, TOURING PLUS, FORERUNNER 310XT, AND 910XT. (*LARGER EDGE COMPUTERS SUCH AS 800, 810, 1000, 1030 MAY INTERFERE WITH VERY STEEP, UPRIGHT, STEM ANGLES.)