Hands-free on a fixed schedule — tap Start all tests before strapping on. You get 15 s to strap to forehead, then voice announces each test. Rhythm per test: speak → beep beep beep (3-2-1) → high beep (go) → 7 s to move to end-range and return → two-beep chime (window closed, peak locked) → voice reads the number → "Return to neutral" → 5 s to settle → chime → next test. Sensor needed — Chrome on Android works; iOS Safari needs sensor permission.