If you use night vision gear, then you have experienced the problem of adjusting the focus between distant and near objects. This focusing process requires both hands and valuable time. But the RFR solves this in a flash with a simple, robust design. Just flip the RFR over the objective lens of your NVD and the RFR provides an instant, crisp 18″ focus. Flip the RFR back out of the way and return to normal 15′ focus. The unit is universal and should mount to almost all night vision gear. We have not tested the product, but it looks priceless for this situation.