Airofit Fingertip pulse oximeter

Pulse oximetry is a non-invasive, painless test that measures oxygen saturation or oxygen levels in the blood. It enables rapid detection of even small changes in the efficiency of oxygen transport to the extremities furthest from the heart, notably the legs and arms.
The pulse oximeter attaches to your finger.
The package contains
The pulse oximeter
A wrist strap
Battery: 2 AAA batteries (not included).
The oximeter is not connected to the app.