The HomePod mini has a hidden and currently unused sensor that can measure temperature and humidity, prompting considerable speculation about what the device could do in the future.

The information was discovered by Bloomberg's Mark Gurman and confirmed by iFixit, which found a component measuring 1.5 x 1.5mm in the vicinity of the power cable. The sensor is manufactured by Texas Instruments and has the designation HDC2010.

At the moment the sensor doesn't actually do anything. But it's possible that it will be activated in a future software update: most obviously, it could be possible to use the speaker to control smart thermostats.

This wouldn't be the first time that Apple has used software to activate a hardware-based feature after a product's launch. The 2008 iPod Touch, for example, didn't have its Bluetooth feature activated until the following year.

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This article originally appeared on Macworld Sweden. Translation by David Price.