The 3Bay Zone is the ultimate swing analyzer. All you have to do is stick the GSA into the club of your choices and turn on the GSA app. Features:- angle of shaft when you strike the ball - Illustrates the difference between your release point and optimal point - Syncs with Iphones, Androids, and Ipads - Sophisticated design - Includes enhancements to old features and new features - Suitable for beginners and pros to improve their game - Real monitoring your swing arc motions - Allows you to monitor your the swing power release point - 3D views to show swing - Indicates/ alerts when you have over-swung - No adjustment after every swing.Features Angle of shaft when you strike the ball Illustrates the difference between your release point and optimal point Syncs with iPhone, androids, and iPad Sophisticated design Includes enhancements to old features and new features Specifications Size: 6 x 3 x 7 in. Weight: 0.625 lbs