Garmin 010-01994-01 Approach CT10 Automatic Club Tracking System (Starter Pack of 3 Sensors)Installed sensor automatically tracks every shot on any club & keeps scorePairs with compatible Garmin(R) golf watches (Approach(R) S20 & S60) to display every stroke, including locations, distances & club typeCollects data from each shot & club so user can analyze strokes gained & other stats used by professionalsStats for each club with a sensor appear up on compatible Garmin(R) golf watch after pulling club from bagAbility to see how far user typically hits each club & view stats for accuracy to fairway or greenIncludes starter pack of 3 sensors & manualApproach(R) CT10 Automatic Club Tracking System (Starter Pack of 3 Sensors)