Designed for today's high-performance crossbows, the Killer InstinctA(R) Max View MV-36 Scope is easy to calibrate to any speed between 340 and 460 FPS. Simply rotate the velocity ring to match the speed of your crossbow and lock it in. Once your velocity is locked in, the LDC reticle provides hold-over information out to 150 yards, so you can make responsible killshots at extended ranges. The reticle is illuminated in your choice of red or green to match ambient light conditions, so you always have the right aim point for the job. Even better, the MV-36 Scope is 100% waterproof, fogproof and shockproof, so it stands up to the most demanding hunts. Works with crossbows from 340-460 FPS LDC drop-compensating reticle illuminates in red or green Locking velocity ring Easy calibration for any shot between 20 and 150 yds. 30mm tube 100% waterproof, fogproof and shockproof Capped windage and elevation turret with tactile adjustments Includes rings and flip-up lens caps