After a chest strap that leaked its ECG by accident and a band that hid everything behind one undocumented byte, here's the device that just tells you how it works, and

Reverse-engineering the Wahoo TRACKR HR — no documentation, no SDK, no authentication. Just a BLE connection and methodical curiosity. The Wahoo TRACKR HR is a rechargeable chest strap heart rate monitor. It costs

How much data is your heart rate monitor actually capable of sharing — and how much is it keeping to itself? If you've ever worn a Bluetooth chest strap during a run