RunScribe RS1B Pro 1x Fitness Tracker, (Blue) Track & analyze advanced metrics, including: Stride Pace & Length, Step Rate, Foot strike Type, Contact Time & Ratio, Pronation Excursion & Velocity, Impact & Braking Gs Auto start & stop, no need to run with your mobile phone. Upload via compatible iOS or Android device post-run Includes Run Scribe web account with full access to metrics, along with online analysis and comparison tools Includes mounting cradles included for heels and laces and replaceable CR2032 battery