Featuring Sig Sauer's BDX technology, the KILO BDX is the world's most advanced laser rangefinder. When paired with a SIERRA3BDX riflescope, the on-board Applied Ballistics Ultralite calculator sends ballistic drop data via Bluetooth directly to the SIERRA3BDX's BDX-R1 reticle, providing an illuminated holdover dot and wind hold. Features: 7 x 25 mm monocular with SpectraCoat anti-reflection coatings for superior light transmission and optical clarity BDX ballistic data xchange capable, providing your BDX riflescope with an automatically illuminated holdover dot through Bluetooth pairing Revolutionary LightWave DSP technology for the fastest and longest distance rangefinder engine HyperScan Technology provides 4 range updates per second in scan mode while RangeLock reports the last range result when ranging distant targets Embedded Applied Ballistics Ultralite with bullet database and support for G1/G7 drag curves Low energy Bluetooth 4.0 for synchronizing up to 25 custom ballistic profiles between the free Sig Ballistic App and rangefinder Advanced OLED display provides a smaller, extremely precise targeting circle along with ballistic info including holdover and angle Line of sight or angle modified range in addition to full ballistic holdover and windage results in MIL or MOA Lumatic display automatically calibrates display brightness to changing ambient light conditions Compact, lightweight magnesium housing with binocular style eyecup and diopter adjustment Free downloadable Sig BDX App for your smartphone, iOS and Android are supported Covered by Sig Sauer's infinite guarantee and electronics limited warranty