VelociRadar Features The Velociradar is a new state-of-the-art radar activated chronograph from Caldwell. The Velociradar 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. VelociRadar Specifications SHOW SERIES STATS (MAX/MIN VELOCITY AVG VELOCITY SD ES) RADAR ACTIVATED CHRONOGRAPH COMPATIBLE WITH NEW CALDWELL APP NOT LIGHT SENSITIVE NO NEED TO SETUP DOWN RANGE RECHARGEABLE LI-ION BATTERY