Android motion sensor in dark 🕵️ detects light, sound, or pressure?

Описание: Android environment sensor functions include light and pressure (barometric). However considering that motion detector apps only work in low-light conditions (and not in complete darkness), either the phones don't have barometric pressure detection hardware, or developers are only using the Light sensor function. Are you an Android developer who can lend insight?
HC-SR04 ultrasonic motion sensor video:
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