SIG SAUERs BDX technology, the KILO BDX 2 is an advanced laser rangefinder. When paired with a SIERRA3BDX 2 riflescope, the onboard Applied Ballistics Ultralite calculator sends ballistic drop data via Bluetooth directly to the SIERRA3BDX's 2 BDX-R1 reticle, providing an illuminated holdover dot and wind hold. Download the free BDX App for iOS or Android to setup ballistic profiles and synchronize custom profiles to your KILO for exact ballistic solutions. features Lightwave DSP, SpectraCoat, AMR, HyperSan technology for the fastest and longest distance rangefinder engine and OLED display.