The USGI 3X Magnifier is a high performance Afocal Telescopic lens that easily attaches to the objective lens of many night vision devices. The 3X Magnifier screws into the internal threads of the PVS-14 or PVS-7 objective lens. The USGI 3X Magnifier is a great accessory that increases the versatility of your night vision monocular. Includes soft carry case.