Like all the B&M dynamo lights we carry, the Secula has a capacitor (standing light) that keeps the light on for 4 minutes after you stop (that's what the "Plus" denotes). Also features over-voltage protection.
Compatible with all B&M headlights and almost all other 6V headlights, but not compatible with Supernova headlights.
Mount allows you to adjust the angle in order to make the surface vertical. This works only on full-coverage fenders, however. Shorter fenders like Raceblades won't let you get to vertical.