Swarovski Optik Binocular Booster, 2x Doubler for EL and SLC "new" Series Binoculars, Except the 8x30 WB.

For all EL and SLC models (except 8 x 30 WB). Will double the magnification. Example: the booster converts the SLC 15x56 WB into a monocular telescope with 30x magnification. Easy to assemble. Simply unscrew one of the two twist-in eyecups and screw on booster.