The new BDX rifle scopes from Sig Sauer feature an
electronic reticle that adjusts to the ballistics of your rifle via the
Bluetooth range finder (supplied as part of the package). Once you have
set you rifle ballistics via the BDX App (IOS & Android) the reticle
will adjust the point of aim once you have used the BDX Rangefinder to
range the distance to your quarry. A very clever system that takes the
guesswork out of shooting as well as being a truck load less expensive
than another well know optics brand!