Advanced LED Dot Slider Sight with Long Battery LifeThis Covert Pro sight upgrades the original slider platform with push button brightness controls gear drive elevation control and PWR DOT center LED dot technology for full brightness control. It includes over 120 pre marked yardage tapes and operates up to 700 hours on a battery. PWR DOT center LED technology Push button brightness controls Gear drive elevation control Over 120 yardage tapes Up to 700 hour battery life