Place one fingertip flat over the rear camera and the flash. Press gently — no gap, no sliding. The torch turns on by itself where supported, so keep still for the full 30s.
How the sensing works
1Camera mode: rest one fingertip over the rear lens and flash — the torch shines through your finger.
2Each heartbeat dims the light passing through, giving a real pulse waveform sampled frame by frame.
3Touch pad mode is the fallback when no camera is available: it reads contact pressure and micro-motion.
4Rhythm, variability and warmth are then graded across every organ system.
Readings are wellness estimates derived from touch and camera sensing, not a medical diagnosis. Consult a clinician for clinical care.