M-Tracer For Golf MT520G Swing Analysis System M-Tracer I'm selling this because I haven't used it much. By simply attaching the main unit to the grip end with the dedicated attachment, you can measure your swing in real-time while actually hitting balls with your favorite club. A high-precision motion sensor analyzes your swing in 1/1000th of a second increments. By linking the M-Tracer MT520G with the M-Tracer golf app, you can measure, analyze, and diagnose your swing for each process. Included Accessories (see photos) ・Main unit ・Attachments x2 ・Top case opener (green) ・Coin battery (already installed in the main unit) For more details, please visit the M-Tracer website: https://m-tracer.golf/top/