The Swarovski Booster For EL 32 And EL 42 will double the magnification of your binoculars in an instant. Easy to assemble: simply unscrew one of the two twist-in eye cups on your binoculars, and screw on the booster.
FEATURES
Double the magnification of your binoculars in an instant
Simply unscrew one of the two twist-in eye cups on your binoculars, and screw on the booster