We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-28 · 6 min read · Independent comparison
If you want a kids' pair with app-based hearing protection and the longest battery life, choose 1MORE HQ20; if you need a lighter, bend-proof headphone with newer Bluetooth and faster charging, choose EarFun K2.
• 1MORE HQ20 — biggest strength: 65 hours of playback plus a 5-minute quick charge that adds 2.5 hours, and a 3-level smart volume system controlled through an app.
• 1MORE HQ20 — biggest trade-off: It has no wired fallback and no explicit water or durability rating, so it's a home-and-classroom headphone more than a rough-and-tumble one.
• EarFun K2 — biggest strength: Bluetooth 5.4, a very light 175 g build, and an ergonomic headband that twists and bends without breaking.
• EarFun K2 — biggest trade-off: Shorter 60-hour battery, a 2-hour full recharge, no 3.5 mm jack, and no app-level volume control.
• Who each is for: The 1MORE HQ20 suits parents who want granular control over volume and the fewest charging interruptions; the EarFun K2 suits parents who want a tougher, lighter, more portable headphone that runs the latest Bluetooth.
The HQ20 is built around one idea: sound control for kids. It uses a 3-level automatic volume system with 75 dB, 85 dB and 95 dB safe limits, and it adjusts down when audio pushes past the ceiling you've set. That ceiling is managed through an app, which is the part that matters most. If you have a child who studies with an iPad and then drifts into videos, you can lock the limit instead of hoping they leave the slider alone.
The other headline is battery. 1MORE rates it at up to 65 hours per charge, and a 5-minute top-up gives you 2.5 extra hours. That combination is genuinely useful for a kid who forgets to plug things in — five minutes before the school run is often all you get. It also supports dual-device Bluetooth, so a tablet and a phone can stay connected at once and the child can switch between study and entertainment without re-pairing. The 40 mm dynamic driver covers 20 Hz to 20,000 Hz, and the snug on-ear cups with leather and plastic shells lean toward isolation rather than open, room-filling sound — good for concentration, less good for a kid who wants to hear you call them to dinner.
Comfort and portability are handled sensibly: a lightweight frame, an adjustable headband, rotating ear cups and a folding design with a carrying case. There's also a 3.5 mm jack, so it works wired when Bluetooth isn't an option. The catch is that the HQ20 is positioned as a learning headphone, not a sports or outdoor one. There's no stated water resistance and no drop rating. If your kid is rough on gear or wants to wear headphones at the playground, this isn't the one I'd hand over first. It's also a 1-year warranty versus EarFun's 18 months.
Buy it if you want app-controlled volume limits, the longest runtime here, and dual-device switching for schoolwork.
Skip it if your child needs something bend-resistant for travel and outdoor use, or you want the newest Bluetooth version.
EarFun's approach is durability and simplicity. The K2 weighs 175 g, uses Bluetooth 5.4 — the newer of the two standards in this comparison — and pairs it with a built-in microphone for hands-free calls. For online classes, that's the practical bit: a kid can answer a teacher without grabbing a phone. The headband is specifically engineered to twist, turn and bend without breaking, and the whole thing folds flat. In a backpack, that matters more than any spec sheet number.
Volume limiting is present but fixed: 74 dB, 85 dB and 94 dB steps, which EarFun says align with WHO recommended levels. There's no app, so you switch between the three limits on the headphone itself with button controls. That's simpler for a younger child or a grandparent doing the supervising — nothing to install, nothing to configure. The 40 mm dynamic drivers also cover 20 Hz to 20,000 Hz and deliver balanced stereo sound with clear vocals and full low end, which is roughly what you want for spoken lessons and music alike.
Battery is 60 hours, recharged over USB-C in about 2 hours. That's a shorter runtime than the HQ20 and a much slower charge, but 60 hours is still weeks of school use between charges. Materials are kids-friendly and stated to comply with RoHS 2.0 and FCC standards and to be CPC-certified, with memory foam in the headband and earpads. The trade-offs are real, though: no 3.5 mm jack at all, so if the battery dies there's no wired rescue; no noise cancelling or stated isolation beyond the passive seal; and a plastic-heavy build that's flexible but not premium-feeling.
Buy it if you want a light, tough, latest-Bluetooth headphone for school and travel with a microphone for calls.
Skip it if you need a wired backup, app-managed volume limits, or the longest possible battery life.
Side-by-Side: Which Should You Choose?
• Best for battery life → 1MORE HQ20 (up to 65 hours vs 60 hours).
• Best for volume control flexibility → 1MORE HQ20 (3-level smart limiting managed through an app).
• Best for set-and-forget simplicity → EarFun K2 (three fixed 74/85/94 dB limits changed with a button, no app needed).
• Best for connectivity → EarFun K2 (Bluetooth 5.4 vs Bluetooth 5).
• Best for durability and portability → EarFun K2 (175 g, bend-resistant headband, foldable, no jack to snag).
• Best for wired backup → 1MORE HQ20 (3.5 mm jack; the K2 has none).
• Best for calls and online classes → EarFun K2 (dedicated built-in mic with hands-free calling).
• Best for multi-device households → 1MORE HQ20 (connects to two devices at once).
In my opinion, the 1MORE HQ20 is the better buy for most families. The app-managed volume limits, dual-device pairing and that 5-minute quick charge solve the two problems that actually break a kid's headphone routine: unsafe volume and a dead battery at the worst moment. The 3.5 mm jack is a quiet bonus that the K2 simply doesn't offer. I'd pick the EarFun K2 only if the child is hard on gear or needs the newest Bluetooth and a microphone for live classes — its bend-resistant build and lighter frame are genuinely better for that. For pure value, check the current price on Amazon before deciding, since the two often land close enough that the specs should decide it, not the number.
what is 40mm driver in headphones
A 40 mm driver is the diameter of the speaker unit inside the ear cup — here, 40 millimeters measured across the diaphragm. Both the 1MORE HQ20 and EarFun K2 use a 40 mm dynamic driver covering 20 Hz to 20,000 Hz, which is the standard full-range span for consumer headphones.
what are 40mm drivers in headphones
They're the moving-coil speaker units that convert electrical signal into sound, sized at 40 mm across. In both of these kids' headphones, that size is a deliberate middle ground: large enough to produce decent bass and clear vocals, small enough to keep the headphone light and comfortable for a child.
which driver is best for headphones
There's no single best size — it depends on the design goal. Larger drivers can move more air and produce stronger low end, while smaller ones suit compact, light builds. What matters more than diameter is tuning and sealing, which is why two headphones with identical 40 mm drivers, like these, can still sound noticeably different.
is 40mm driver good for headphones
Yes, 40 mm is a solid, widely used size for on-ear and over-ear headphones, and it's a sensible choice for kids' models because it balances sound output against weight. Both the HQ20 and K2 pair their 40 mm drivers with a 20 Hz–20,000 Hz range, which covers music, speech and video comfortably.
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