Featuring an advanced HDX 6x optical system, the SIG SAUER SIERRA6 BDX Rifle Scope utilizes Ballistic Data Xchange (BDX) and Bluetooth to provide an illuminated holdover dot on targets at long range, when coupled with a BDX capable KILO rangefinder. The second focal plane reticle combines with digital focal plane OLED illuminated ballistic holdover dots. MOTAC (Motion Activated Illumination) automatically powers up the illumination when the scope-mounted weapon is picked up or moved, and powers down to save battery life when the weapon remains idle. LevelPlex Digital Anti-Cant System gets your weapon squared with no cant (+/- 0.5) so that compensations stay true. The innovative KinETHIC kinetic energy transfer indicator aids in ethical shooting by indicating when the bullet's energy on target drops below a threshold that can be set by the hunter using the Sig BDX App. The scope is powered by 2 CR2032 batteries (included). Premium glass with SPECTRACOAT anti-reflection lens coatings provide optimum clarity. The SIG SAUER SIERRA6 BDX Rifle Scope boasts an IPX7 waterproof rating and is argon gas-purged for fogproof performance. Advanced HDX 6x optical system Utilizes Ballistic Data Xchange and Bluetooth Pairs with BDX capable KILO rangefinder Illuminates holdover dot on target LevelPlex Digital Anti-Cant System Kinetic energy transfer indicator Motion Activated Illumination Anti-reflection lens coatings IPX7 waterproof Argon gas-purged for fogproof performance