The chirp is a safety signal, not a low-battery warning
A tracking tag is useful precisely because it can go unnoticed: it can sit in a bag or coat while nearby phones help its owner locate it. That same quietness creates a risk if someone hides a tag to follow a person instead. The sound is meant to make an unexpectedly traveling tag easier to discover.
An AirTag can chirp after it has been away from its owner for a period of time. The separation alone does not mean someone is being tracked; a tag left behind in a car or luggage may also meet that condition. The sound is a warning that the tag is no longer simply accompanying its owner, not proof of who placed it or why.
Why sound matters when a phone may not help
Bluetooth tracking works at short range: nearby devices can detect a tag and relay its location to its owner. A person carrying an unfamiliar tag may not know it is there, and may not use a phone that displays a digital alert. A chirp gives the tag a way to announce itself directly, without requiring the person to open an app or recognize a notification.
That makes the alert a deliberate tradeoff. A tag that stays silent is less intrusive when it is legitimately separated from its owner, but also easier to misuse without the owner’s knowledge. An audible signal can be inconvenient in ordinary situations; its purpose is to make covert tracking harder.
The practical clue is simple: if a tag sounds from an item you do not recognize, look for the device rather than assuming the noise is a fault. The feature turns a hidden piece of tracking hardware into something a nearby person can notice.
