The Competition Electronics ProChrono LTD Chronograph is the new generation of Competition Electronics' popular ProChrono model based on a time proven design that has been measuring "almost anything that shoots" since 1985! Great for firearms, shotguns, archery, airguns, and paintball. Everything is included for outdoor use. For indoor use, Competition Electronics recommends their optional Indoor Lighting System.FeaturesInternal and external refinements with updates to the circuitry and enclosure designBuilt in full featured operating system with multiple shot string memory and statisticsSensing system compatible with a wide variety of light conditions and projectilesFaster internal shot clock for improved accuracy to +/- .5% or betterMade in the USA quality at an affordable priceTwo year warrantee against defects in material and workmanship, and a 1/2 price repair guaranteeOver 30 years of experience in chronograph design and manufacturingReplaceable Alkaline 9 volt batte...