Your headphones stutter in the kitchen when the microwave is on, the mouse jumps when the router is busy, and none of it seems related.
It is all one thing, and nothing you own is faulty. Bluetooth shares a narrow slice of radio with an enormous amount of other equipment, and the sharing is the design rather than a flaw.
I went to the body that writes the Bluetooth specification for the numbers, because the band and the channel count explain the interference better than any advice about moving closer.
The band, exactly
One line from the people who define it.
The Bluetooth SIG states the band as the 2.4 GHz ISM band on its technology overview, with the range it uses running from 2.402 to 2.480 GHz.
ISM stands for industrial, scientific and medical, and it is an unlicensed band, which is why nobody had to ask permission to use it.
Unlicensed is the whole story. Wi-Fi, microwave ovens, cordless phones, baby monitors and wireless doorbells are all in there with you. So interference is not a fault in your gear. I read it as a crowded band behaving like one.
How Bluetooth copes with the crowd
Not by shouting louder, which is the interesting part. Both kinds of Bluetooth hop, and the Bluetooth SIG names the technique as "Frequency-Hopping Spread Spectrum (FHSS)."
The radio changes channel constantly rather than sitting on one. A channel that is busy at that instant costs one hop, not the connection.
That is why interference sounds like stutter rather than silence. The link survives and the audio does not quite. And it is why moving two feet sometimes fixes it. You have changed which channels are usable, not the distance.
The channel counts, which differ by type
Two Bluetooth radios, two layouts, and it matters when you compare them to Wi-Fi.
Documented by the Bluetooth SIG for Bluetooth LE: "40 channels with 2 MHz spacing (3 advertising channels/37 data channels)." And for the classic radio: "79 channels with 1 MHz spacing."
Three of the LE channels do the introductions. Advertising channels are how your device announces itself before anything is paired. The rest carry your audio and your mouse movements, thirty-seven of them, hopping.
Why Wi-Fi is the neighbor that matters most
Because of how much wider it is. A Wi-Fi channel on 2.4 GHz is around twenty megahertz wide and a classic Bluetooth channel is one, so a single busy Wi-Fi network sits across a large block of Bluetooth's channels rather than beside them.
That is the real cause of most household stutter, more than distance and more than walls.
Moving your Wi-Fi to 5 GHz empties the neighborhood. It also usually makes the Wi-Fi faster, which is a separate win.
The microwave, which really is to blame
Not a myth, and the reason is specific. Microwave ovens work at about 2.45 GHz, which sits in the middle of the band Bluetooth uses.
They leak a little while running. Sealed, shielded, and still enough for a radio a few feet away to hear it.
A dropout that lasts exactly as long as the reheat is not a coincidence. It is the clearest demonstration of the band there is.
Ours: nothing is broken and nothing needs fixing. Stand somewhere else for two minutes.
What this does not explain
Because not every Bluetooth problem is radio. A device that will not connect at all never got as far as interference. Pairing has an order and it matters.
A connection that fails at a consistent distance is range, not congestion. And range is not the number on the box.
Stutter that follows you around the house is usually the device, since the interference does not. And a radio that vanishes from Windows entirely is a software problem. Frequencies have nothing to do with it.
What to actually do about the interference
Four things, cheapest first. Move the phone or laptop to the same side of your body as the headphones. You are the obstacle that moves with you.
Put your Wi-Fi on 5 GHz if the router offers both. That is the single biggest change available. If you use a dongle, keep the Bluetooth receiver away from a USB 3 port. Those ports are a known source of noise in this exact band.
And accept the microwave. I have never seen a setting on any device win that one.
**Status: the numbers here are the Bluetooth SIG's own published figures for the band, the channel counts and the hopping technique, read 19 September 2026.
No interference was measured, no spectrum was analyzed and no figure in this article was produced by testing anything in this room.**
What frequency does Bluetooth use?
Your devices use the 2.4 GHz ISM band, with the Bluetooth SIG giving the used range as 2.402 to 2.480 GHz. It is an unlicensed band shared with Wi-Fi, microwave ovens, cordless phones and a great deal of other equipment.
How many channels does Bluetooth have?
It depends which kind. The Bluetooth SIG gives Bluetooth LE 40 channels with 2 MHz spacing, of which 3 are advertising channels and 37 carry data. The classic radio has 79 channels with 1 MHz spacing.
Does a microwave really interfere with Bluetooth?
Yes. Microwave ovens operate at about 2.45 GHz, in the middle of the band Bluetooth uses, and they leak enough while running to be heard nearby. A dropout that lasts exactly as long as the reheat is that, and nothing is faulty.
Why does Wi-Fi interfere with Bluetooth?
Because a 2.4 GHz Wi-Fi channel is about twenty megahertz wide and a classic Bluetooth channel is one.
A single busy Wi-Fi network covers a large block of Bluetooth's channels rather than sitting beside them. Moving Wi-Fi to 5 GHz removes it.
The Short Version
- Bluetooth uses the 2.4 GHz ISM band, from 2.402 to 2.480 GHz.
- ISM is unlicensed, which is why so much other equipment is in there.
- Both kinds of Bluetooth use frequency hopping rather than one fixed channel.
- Bluetooth LE has 40 channels at 2 MHz spacing, 3 of them advertising.
- Classic Bluetooth has 79 channels at 1 MHz spacing.
- A Wi-Fi channel is about twenty times wider than a classic Bluetooth one.
- Microwave ovens run at about 2.45 GHz, in the middle of it.
- Hopping is why interference sounds like stutter rather than silence.
Where to Next
Move your Wi-Fi to 5 GHz if the router offers it, because that is the biggest single change you can make.
Keep the transmitting device on the same side of you as the headphones, since your body is the obstacle that travels with you.
If you use a Bluetooth dongle, move it away from USB 3 ports and off the back of a busy hub.
And stop treating the microwave as evidence of a fault, because everything in this band does that.
Heard a dropout that lines up with something not on this list? Say what was running at the time in the comments. The band is busier than the list above.
Isaac Smith is the founder and editor of PC Glance, a website that covers computers, laptops, and technology. He is a tech enthusiast and a computer geek who loves to share his insights and help his readers make smart choices when buying tech gadgets or laptops. He is always curious and updated about the latest tech trends.