The Swarovski FRR-32 Forehead Rest (for the EL Range 32mm bodies with Tracking Assistant) helps observers using the EL Range 32mm to keep the binoculars steady while viewing or ranging. This optional accessory attaches by replacing the cover of the battery compartment and by plugging an anti-twist pin into the bridge. The FRR-32 is adjustable to your facial contours. Swarovski Optik Swarovski FRR-32 EL Range 32 Forehead Rest 49159