swarovski 2x doubler
 

A quote from cabelas " This one-piece ocular doubles the magnification of any 42mm, 50mm, or 56 mm SLC or EL binocular with the 2X doubler and change your 10x binocular into 20X spotting scope waterproof"

comes with carry case. this thing looks to be brand new.. i don't have box. I inheritted this and have no use for it. sells for 419.99 at cabelas. $250 obo tyd pics on request