How to test Bluetooth tracker range at home in ten minutes

The only way to know what a tag will do in your house is to test Bluetooth tracker range in your house. Every figure on every listing is a line-of-sight best case measured in the open, and your hallway is not the open. This is a ten-minute method using nothing but the tag, your iPhone and a bit of pavement, and a table of what each result means.

What does the quoted range figure actually mean?

It means the distance at which the two radios can still hear each other with clear air in between and nothing absorbing the signal. Manufacturers quote it because it is the only number that can be measured repeatably; it is honest as a specification and useless as a prediction.

The realistic indoor figure is a fraction of it. A typical British house is a stack of obstacles the test never included: a solid Victorian brick wall, a cavity wall with insulation in it, a plasterboard stud partition, a cast-iron bath, a fridge, a foil-backed loft hatch and a body carrying the phone. Each one takes a bite.

How do I test the range in open air?

Do this first, because it establishes that the tag is working properly before you start blaming your walls.

1. Find a straight, empty stretch — a quiet road, a park path, an empty car park. You want at least eighty metres of nothing.
2. Leave the tag on a bench or a post at about waist height. On the ground, the earth itself absorbs signal and you will under-read badly. You should see the item showing as connected in Find My before you move.
3. Walk away in a straight line, phone in your hand, screen on. Keep your body from directly blocking the line — hold the phone out rather than in a back pocket.
4. Stop every twenty paces and try Play Sound. You should hear it. The moment the button fails or the item flips out of a connected state, stop.
5. Pace the distance back. A normal adult stride is roughly three quarters of a metre; count steps and multiply. That number is your open-air range.

A healthy coin-cell tag should manage a good stretch of a football pitch. If you lose it at fifteen metres in clear air, the tag or the cell is the problem, not physics.

How do I test the range through the house?

Now the useful test, because this is where you will actually lose things.

1. Leave the tag in the room you lose things in — the kitchen worktop, the hall table, the bedside drawer.
2. Walk to the furthest point of the house from it and try Play Sound. Note whether the tag responds and whether you can hear it.
3. Repeat from the garden, the front step and the pavement outside. The front step result is the one that matters most, because it predicts whether you will be told you have left your keys behind as you walk off.
4. Repeat with the tag inside a bag, then inside a metal tin. You should see a sharp drop with the tin. That is the Faraday effect, and it tells you where not to hide a tag.
5. Write down the four answers. They are your house's real map, and they beat any review.

What results should I expect?

Nothing in the right-hand column is a defect except the first. Bluetooth at this power level is obstacle-shy by design; that is the price of a radio that can run for years on a coin cell.

Why did my result change the second time?

Because 2.4 GHz is shared and noisy. Your own Wi-Fi, the neighbours' Wi-Fi, a microwave oven mid-cycle, a wireless doorbell and a baby monitor all sit in the same band, and the picture changes through the day. Test twice, on different evenings, and take the worse of the two as your working figure.

Orientation matters too. A tag lying flat on a metal draining board radiates quite differently from the same tag hanging on a hook two feet away. If a result surprises you, move the tag ten centimetres and try again before concluding anything.

What do I do if it fails the test?

Change the cell first — it costs a couple of pounds and eliminates the most common cause. Then repeat the open-air test. If a fresh CR2032 does not restore a decent open-air distance, the tag is faulty and should go back.

That is the real reason to run this on the day it arrives rather than three months later. A UK shop should give you a proper return window; ours is 30 days with no reason required, and the details are on the shipping and returns page.

How BlueTag performs when you test it

BlueTag is specified at up to 60 m / 200 ft on the Bluetooth link, and that is the open-air number the first test above measures. Expect a good part of it in a garden and roughly a third to a half of it through the middle of a brick house — which is enough to ring the tag from anywhere in a normal home, and not enough to reach one left in a shop at the end of the road.

Past the link, the behaviour changes completely and no walk test can measure it: the Apple Find My network takes over, passing Apple devices report an encrypted position, and only your Apple Account can read it. That is the half of the specification that matters when something is genuinely lost rather than mislaid. Apple hardware only, from iOS 14.5 onwards; the case is sealed to IP67 and the coin cell lasts a couple of years. A box contains two tags, delivered free anywhere in the UK, under £15. Our companion piece on what walls and metal do to the signal explains the physics behind the numbers you just measured, and you can see the full specification here.