Wearables using infrared ear thermometers are already widely available. The idea reportedly caught Apple’s eye while developing updates to its airpods.

Wearers can tap the buds three times to activate temperature monitoring, with continuous measurement and an’abnormal temperature alert’. For now, the device is for demonstration purposes only until it has been brought into compliance with related regulations.

The Wall Street Journal reported in October that Apple was looking into adding the feature in its airpods. An earlier rumor mentioned temperature monitoring as a feature for the Apple Watch series 7, but it was n’t there when the device launched in September.

Bodytrak showed off its own temperature-monitoring earbuds a few years ago. But they do n’t appear to be production-ready yet.