MantisX is a revolutionary training system that helps you improve your shooting precision. Use of the app requires a MantisX Sensor which can be bought here: http://www.mantisx.com . It attaches to any picatinny rail (or rail adapter if your firearm doesn't have a built-in rail). The internal electronics of the MantisX Sensor collect movement data before, during, and after your shot. The app analyzes the data and diagnoses your shooting mechanics, provides real-time coaching, and determines what you need to focus on to improve most quickly. MantisX is a powerful tool that will make your training more efficient and effective.