Petzl E80004 Pro adapt Self-adhesive decorative accessories for attaching a duo head lamp with all helmet types the Pro adapt system consists of two self-adhesive components required to hold a duo S or Duo Z2 head lamp, set in a helmet, without affecting your normal the rotational movement of the lamp. Extremely shock resistant and tough moisture resistant system. Compatible with the Petzl Helmets with or without a visor. At other helmets, the compatibility be checked from the manufacturer.