BlueKitHow to find a lost Bluetooth device with your iPhone
Your iPhone can find a lost Bluetooth device by measuring the strength of the signal it broadcasts. Use a Bluetooth scanner app such as BlueKit, pick the device from the list and walk slowly: a stronger signal and a smaller estimated distance mean you're getting closer. This works with headphones, earbuds, smartwatches, fitness trackers, speakers and other Bluetooth Low Energy devices from any brand, as long as they're powered on and within about 10 meters.
How Bluetooth finding works
Most modern wireless devices use Bluetooth Low Energy (BLE) and announce themselves several times a second with a short radio message called an advertisement. Your iPhone can hear these messages even if the device isn't paired with it, and it can measure how strong each one is. That measurement is called RSSI (received signal strength indicator), in dBm.
The closer you are, the stronger the signal. BlueKit turns the RSSI into a five-level signal meter and an estimated distance in meters, and refreshes both every couple of seconds as you move.
What the signal strength means
| Signal level | RSSI | Approx. distance | Meaning |
|---|---|---|---|
| 5 of 5 | −50 dBm or stronger | About 1 m or less | Within arm's reach |
| 4 of 5 | −50 to −60 dBm | About 1–2 m | Very close |
| 3 of 5 | −60 to −70 dBm | About 2–5 m | Same room |
| 2 of 5 | −70 to −80 dBm | About 5–10 m | Nearby |
| 1 of 5 | Weaker than −80 dBm | 10 m or more | Edge of range |
Why the distance is only an estimate
Signal strength depends on more than distance. Walls, furniture, water (including people) and even the angle of the device's antenna weaken it, and devices broadcast at different power levels. So the same reading can mean slightly different distances for different devices.
The fix is simple: move slowly, pause for a few seconds in each spot and follow the trend. If the signal climbs as you walk in one direction, keep going.
Which devices can you find?
- Earbuds and headphones: AirPods, Beats, Galaxy Buds and other brands
- Wearables: Apple Watch, smartwatches and fitness trackers
- Trackers: AirTag and other Bluetooth tags within range
- Accessories: keyboards, mice, Apple Pencil and game controllers
- Speakers: HomePod and portable Bluetooth speakers
Some older devices use only classic Bluetooth, not Bluetooth Low Energy. iPhone apps can't scan for classic-only devices, so those may not appear.
Why a device might not show up
- It's off or out of battery. A device with no power doesn't broadcast.
- It's in a closed charging case. Many earbuds go quiet inside their case.
- It's connected to another device. Some headphones stop advertising while connected to another phone or laptop. Turn Bluetooth off on your other devices while you search.
- It's out of range. Indoors, Bluetooth usually reaches around 10 meters (33 feet).
- Bluetooth permission is off. Check Settings > Privacy & Security > Bluetooth.
Check the maker's app too
Many headphone, watch and fitness-tracker makers include a find-my-device or last-known-location feature in their companion app. If your device is out of range or its battery is dead, that last location is the best place to start your Bluetooth search.
Find a lost Bluetooth device step by step
- Turn on Bluetooth. Open Control Center and make sure Bluetooth is on. On first launch, allow BlueKit to use Bluetooth.
- Go to where you last had it. Bluetooth only reaches about 10 meters, so start in the place you last used the device.
- Scan for nearby devices. Open BlueKit. Every Bluetooth device broadcasting nearby appears in the list with its signal and distance.
- Pick your device. Tap your device by name to open its live signal. Unsure which one it is? Walk a few steps and see which reading changes.
- Follow the signal. Walk slowly, pausing every few steps. Head in the direction where the signal rises and the distance falls.
- Narrow it down. At the strongest reading, search within arm's reach: under furniture, in bags and in pockets.
Questions and answers
Can my iPhone find non-Apple Bluetooth devices?
Yes. Bluetooth scanning works with any device that broadcasts Bluetooth Low Energy, including earbuds, headphones, watches and trackers from other brands.
Does the device need to be paired with my iPhone?
No. Your iPhone can pick up the Bluetooth signal of nearby devices whether or not they're paired with it.
How far away can I find a Bluetooth device?
Usually about 10 meters (33 feet) indoors. Open spaces can allow more; walls and floors reduce it.
Can I find a Bluetooth device that's turned off?
No. A device that's off or out of battery doesn't broadcast, so no Bluetooth scanner can detect it. Check the device maker's app for a last known location instead.