In a parked vehicle, a head unit operating in low-power mode draws attention to a living being in a cabin of a parked vehicle. It does so by using a microphone to monitor said cabin for out-of-domain sounds, detecting a signal originating within said cabin, said signal being an acoustic signal that is representative of an out-of-domain sound, classifying said acoustic signal as being indicative of the existence of the living being within said cabin of said vehicle, and sending an alert to a first person.