We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 6 min read · Independent comparison
If you want a wired, volume-limited pair built for kids and school use, choose EarFun K3; if you need a wireless, low-latency gaming headset with a boom mic, choose BETMI Gaming Headset Compatible. Both run 40mm dynamic drivers and cover the same 20 Hz–20,000 Hz range, so the real decision comes down to one question: who is wearing them and what are they plugged into?
• EarFun K3 biggest strength: Purpose-built for kids — 40mm drivers, a volume limit, USB-C wired connection, and a foldable over-ear frame made from recycled and eco-friendly materials. No battery to charge, no pairing, no setup.
• EarFun K3 biggest trade-off: It is wired only, and the USB-C connector is for audio — it is not compatible with a USB-C charging port. There is also no microphone and no noise control.
• BETMI Gaming Headset Compatible biggest strength: True wireless freedom via 2.4GHz dongle or Bluetooth 5.2, 7.1 surround sound, a detachable AI+ENC noise-cancelling mic, and up to 40 hours of playtime.
• BETMI Gaming Headset Compatible biggest trade-off: It is aimed at adults, needs charging, and the Xbox setup depends on plugging in the 12-pin USB dongle — more moving parts than a simple wired pair.
• Who each is for: EarFun K3 for parents buying for a child's tablet, Chromebook or school bag. BETMI for a gamer who wants surround sound and voice chat across Xbox, PC, PlayStation or Switch.
The EarFun K3 is a kids' headphone first and an audio product second, and that ordering is deliberate. The 40mm dynamic drivers sit behind a 32-ohm impedance and 100 dB sensitivity, which tells you these are easy to drive — a tablet, Chromebook or PC will push them to a comfortable listening level without any amp or dongle. The 20 Hz–20,000 Hz frequency range is the standard full-range window, so music, video lessons and games all land in familiar territory rather than sounding thin or boomy.
Who should buy it: parents and schools shopping for a child or teen who needs a durable, no-fuss, volume-limited wired headphone for a tablet, iPad, Chromebook or PC. Who should skip it: anyone who wants wireless freedom, a microphone for calls or gaming chat, or noise cancellation. There is none of that here. And note the connector caveat carefully — this is an audio USB-C connection, not a charging port, so it will not work as a charging cable.
BETMI Gaming Headset Compatible: Who It's For
The BETMI headset is the opposite kind of product: a feature-dense gaming tool for adults. It gives you two ways to connect. The 2.4GHz USB dongle is the low-latency path — under 20ms — and it is the one designed for official Xbox controllers, with an included Type-C to USB-A adapter opening the door to PC, Mac, Android TV and PS-5. Bluetooth 5.2 is the second path, suited to phones, tablets and Switch, with a 10-meter range. That dual-mode design is genuinely useful if you game on more than one platform.
The 40mm speakers here are paired with 7.1 surround sound processing, and the 16-ohm impedance makes them trivially easy to drive wirelessly. On the mic side, BETMI combines AI algorithms with ENC adaptive environmental noise cancellation across a detachable boom mic and a built-in mic — the detachable one for in-game chat, the built-in one for commuting and travel. A one-button mute keeps you from accidentally broadcasting to your squad. Add a green LED accent you can switch off, memory protein earmuffs, an adjustable padded headband, and a rotatable foldable design, and you have a headset built for long sessions.
Battery life is the headline comfort feature: 2.5 hours to full charge and up to 40 hours of playtime per the specs, with a listed average life of 24 hours. At 260g it is heavier than the EarFun K3's 207.9g, but the padding is clearly designed to offset that. Who should buy it: gamers on Xbox Series X/S, Xbox One, PC, PlayStation, Mac, Android or Switch who want surround sound and voice chat. Who should skip it: young children, or anyone who wants a plug-and-play wired headphone with zero charging.
• Best for young kids and school use → EarFun K3. Volume limit, 32-ohm easy drive, recycled materials, wired simplicity.
• Best for gaming with voice chat → BETMI Gaming Headset Compatible. Detachable AI+ENC mic, mute button, 7.1 surround sound.
• Best for battery life → BETMI Gaming Headset Compatible. Up to 40 hours of playtime and a 2.5-hour charge time versus no battery at all.
• Best for zero-setup reliability → EarFun K3. No pairing, no dongle, no charging — plug into USB-C and listen.
• Best for multi-platform flexibility → BETMI Gaming Headset Compatible. 2.4GHz dongle plus Bluetooth 5.2 across Xbox, PC, PlayStation, Mac, Android and Switch.
• Best for travel and portability → Tie, for different reasons. Both fold, but EarFun K3 is lighter at 207.9g and needs no charger.
• Best for a shared family device → EarFun K3. One cable, one volume limit, nothing to misconfigure.
• Best for immersive solo sessions → BETMI Gaming Headset Compatible. Surround processing, padded memory protein earcups and a 33-foot wireless range.
In my opinion, these two barely compete — they solve different problems. If I were buying for a child, I would pick the EarFun K3 without hesitation: the volume limit, the recycled build, the 40mm drivers and the wired USB-C connection are exactly what a kid's headphone should be, and there is nothing to charge or lose. If I were buying for myself as a gamer, I would pick the BETMI Gaming Headset Compatible, because the 7.1 surround sound, sub-20ms latency and detachable noise-cancelling mic are features the EarFun simply does not attempt. Match the headset to the person, not the spec sheet.
FAQ
what is 40mm driver in headphones
what are 40mm drivers in headphones
They are the sound-producing component that converts electrical signal into sound. In both of these headsets the 40mm dynamic drivers cover a 20 Hz–20,000 Hz frequency range, which spans the full range of normal human hearing.
which driver is best for headphones
There is no single best size — it depends on tuning and the housing around the driver. A larger driver can move more air, but impedance, sensitivity and enclosure design matter just as much. The EarFun K3 runs 32 ohms at 100 dB; the BETMI runs 16 ohms at 88 dB.
is 40mm driver good for headphones
Yes, 40mm is a solid, widely used size for over-ear headphones and covers everyday music, video and gaming well. Both products here pair their 40mm drivers with a full-range 20 Hz–20,000 Hz response, so the driver size itself is not the deciding factor — the wired kid-friendly design versus the wireless gaming feature set is.
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See also: MIDOLA Kids vs BETMI Gaming Headset Compatible: 40mm Driver, JLab Neon on-Ear vs EarFun K2: 40mm Driver Headphones, Cleer Enduro 100 vs JVC Ultralight Gaming Headset