Hunters Dan and John Pickar put the Sig Sauer BDX system to the test on the prairie dog town. The pair finds the Ballistic Data Exchange system to be easy and fun to use! The BDX system uses Bluetooth technology to communicate between Sig Sauer’s BDX rangefinders and rifle scopes. Set up is quick. Plug a rifle’s ballistics into the app and you are off and shooting with deadly accuracy in no time.