Pick your tracker.

The tracker. It sits in the throat of your racket and records every shot you hit — spin, speed, where on the string bed you made contact, and what that contact cost your arm.

Twice the sample rate and 32 GB on board, for players who chart every session and coaches who want the raw file rather than the summary.

Shuttle contact is a fraction of a ball strike, and a badminton frame will feel three grams. AIR is shorter, lighter and sprung soft enough to read a net tumble.

Two TRACQUET ONE trackers, paired out of the box. Doubles partners get one shared session file instead of two that have to be reconciled afterwards.

A machined puck that pulls the tracker in, charges it in forty minutes and pushes the session to your phone on the way home.

Four bays for coaches and clubs. Drop a squad's trackers in after a session and every file is uploaded and attributed by the time you have locked up.

Three swap-in springs. The spring sets how the tracker is suspended in the frame, which changes both what your arm feels and how the sensor reads a strike.

Three knurled collars in silver, graphite and champagne. The one part of the tracker you actually touch, so it may as well match the frame.

A hard shell with foam cut for a tracker, three springs, a dock and two spare collars. Sized to sit in the pocket of a six-racket bag.