The Velociradar Alpha is the newest state-of-the-art radar activated chronograph from Caldwell. The Velociradar Alpha uses 60 hertz active radar to track bullet velocity and is compatible with the new Caldwell smartphone app so you can store all your shot data from each range trip with ease. It's simple to set up packs away compactly for convenient transport and does not require the shooter to set it up downrange therefore there's no risk of impacting the system with a bullet. Unlike the standard Velociradar from Caldwell the Alpha model will track bullet velocity up to 100 yards and it will pattern shotguns.