The next generation of the 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 (part# CEI-4100). Requires one 9 volt alkaline battery for operation (not included).FeaturesOn-board Bluetooth connectivity, and more options with free apps for iOS, Android, Kindle, PC, and MacInternal 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 better2 year warranty against defects in material and workmanshipOver 30 years of experience in chronograph design and manufacturingReplaceable A...