The Equivital LifeMonitor measures core temperature using an ancillary ingestible core temperature capsule that is swallowed. The capsule contains a miniature radio that transmits the temperature reading pseudo randomly every 15 seconds, received by the LifeMonitor sensor electronics module. This data is stored locally, time stamped with all other measured data. The precision of this temperature is 0.01o C.
The core temperature capsule battery life is 10 days and it is single use. It is has FDA 510K and medical CE clearance for use as a medical device in humans.