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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a wireless everyday headphone with marathon battery life and app-based sound tuning, choose Sony WH-CH520; if you need a kid-safe, wired headphone for school and shared devices, choose AILIHEN I35. These two are not really rivals fighting for the same ear — they are built for two different lives, and picking the wrong one is the only real mistake here.
• Sony WH-CH520 — biggest strength: Up to 50 hours of battery life with a 3-minute quick charge that adds roughly 1.5 hours of playback, plus Bluetooth 5.2 multipoint and app EQ.
• Sony WH-CH520 — biggest trade-off: No wired jack at all, no active noise cancelling, and it is sold as an International Version with no warranty.
• AILIHEN I35 — biggest strength: A hard 93dB volume limiter, reinforced bend-resistant headband, braided cable and a 12-month manufacturer warranty.
• AILIHEN I35 — biggest trade-off: It is wired only, so your child is tethered to the device, and nothing about it is aimed at adult critical listening.
• Pick Sony WH-CH520 if you are an adult or teen who wants one flexible wireless headphone for commuting, calls and all-day music.
• Pick AILIHEN I35 if you are buying for a child aged 3+ who needs a safe, tough headphone for a Chromebook, tablet or school-issued device.
The WH-CH520 is an on-ear wireless headphone built around one idea: stay out of your way for as long as possible. Sony rates the battery at up to 50 hours, and the quick-charge function means a 3-minute top-up buys you about 1.5 hours of listening. If you have ever watched a headphone die twenty minutes into a train ride, you understand why that spec matters more than any marketing claim. You plug in USB-C, wait a few minutes, and you are back.
Connectivity is the second half of the story. Bluetooth 5.2 with multipoint means the WH-CH520 can hold two devices at once — laptop and phone, for example — so a call can interrupt your podcast without you re-pairing anything. Swift Pair and Fast Pair speed up that initial setup, and there is voice control as well as physical buttons on the ear cups. In my opinion, that button-plus-voice combination is the right call for an everyday headphone, because touch controls on cheap headphones are often more frustrating than useful.
Sound is where Sony leans on software. The Dynamic Driver covers a 20 Hz–20,000 Hz range at 24 ohm impedance, and the Digital Sound Enhancement Engine (DSEE) is designed to restore high frequencies that get lost when compressed audio is streamed. The Sony Headphones Connect app adds EQ settings, so you can push the tuning toward your own taste rather than accepting the default. The built-in microphone with ambient noise reduction handles calls, which is genuinely useful if you take meetings from a noisy room.
Who should buy it? Adults and older students who want one wireless headphone for music, podcasts, audiobooks and calls, and who value battery life over everything else. Who should skip it? Anyone who needs a wired connection — there is no headphone jack here, so a dead battery means silence. Anyone who needs active noise cancelling should look elsewhere, since noise control is listed as none. And note the fine print: this is an International Version sold without warranty, which is a real consideration if you like the safety net of a manufacturer guarantee.
The AILIHEN I35 is a completely different animal, and it is honest about that. This is a wired on-ear headphone for kids, and its headline feature is a strict 93dB volume limiter. For parents, that single number is the whole pitch — it caps how loud the headphone can get, which matters when a child is wearing it for hours of classroom learning, reading practice or video. The memory-protein ear cushions and ultra-soft padded headband are there for the same reason: long sessions without pressure points.
Durability is the second design pillar. AILIHEN builds the I35 with a reinforced, bend-resistant headband and a tough braided cable, aimed squarely at daily K12 use. Anyone who has bought a child a flimsy headphone knows how that story ends, so the reinforced frame plus the collapsible design — which lets it fold into a backpack — reads like a spec sheet written by someone who has met a ten-year-old. The adjustable headband fits kids from age 3 up, and the whole thing is deliberately lightweight.
The I35 is wired, and that is a feature rather than a flaw in this context. A standard 3.5mm jack works with Kindle Fire tablets, Switch, Chromebooks, PCs and most school-issued devices, with no pairing, no charging and no "my headphones won't connect" panic five minutes before class. The inline HD microphone on the braided cable handles virtual classes and calls, and a single button keeps operation simple for small hands. Inside, a 40mm dynamic driver at 32 ohm impedance delivers clear, balanced sound, and sound isolation helps block some surrounding classroom noise.
Who should buy it? Parents, grandparents and teachers shopping for a child aged 3 and up who needs a safe, tough, universally compatible headphone. It also makes a sensible gift, since it arrives with a 12-month manufacturer warranty. Who should skip it? Adults who want wireless freedom, anyone who wants app EQ or multipoint, and anyone who needs a headphone for serious music listening rather than schoolwork and entertainment.
• Best for battery life → Sony WH-CH520. Up to 50 hours, plus a 3-minute quick charge for about 1.5 hours of playback. The I35 never needs charging because it is wired.
• Best for young kids → AILIHEN I35. The 93dB volume limiter, age 3+ fit and reinforced headband are all designed around child safety and rough handling.
• Best for wireless freedom → Sony WH-CH520. Bluetooth 5.2, multipoint, Swift Pair and Fast Pair. The I35 has no wireless mode at all.
• Best for school-issued devices → AILIHEN I35. A plain 3.5mm jack works with Chromebooks, Kindle Fire tablets, Switch and PCs without pairing.
• Best for sound customization → Sony WH-CH520. DSEE processing plus EQ in the Sony Headphones Connect app let you shape the tuning.
• Best for calls in noisy places → Sony WH-CH520. The built-in mic with ambient noise reduction is aimed at clearer conversations. The I35's inline mic is fine for classroom chat and voice notes.
• Best for durability against kids → AILIHEN I35. Bend-resistant headband, braided cable and a 12-month warranty versus Sony's no-warranty International Version.
• Best for travel and commuting as an adult → Sony WH-CH520. Lightweight on-ear design, foldable storage and no cable to snag. The I35 folds too, but it is sized and tuned for children.
If I were buying for myself, I would take the Sony WH-CH520. The 50-hour battery, multipoint Bluetooth and app EQ make it a genuinely useful everyday headphone, and the quick charge is the kind of feature you appreciate precisely when you have forgotten to plug anything in. I would accept the trade-offs knowingly: no wired fallback, no active noise cancelling and no warranty on this International Version. If I were buying for a child, though, I would not hesitate on the AILIHEN I35 — the 93dB limiter and reinforced build are exactly what that job needs, and the wired 3.5mm connection removes every pairing headache. Two different buyers, two different answers, and no reason to force a single winner. Check the current price on Amazon before you decide, since both sit in very different budget tiers.
FAQ
No. The WH-CH520 is wireless only, with no headphone jack listed. If the battery runs flat you cannot plug in a cable — you charge via USB-C, and a 3-minute quick charge gives roughly 1.5 hours of playback.
They are built with a strict 93dB volume limiter specifically to protect young ears, and the padded headband and memory-protein cushions are designed for long sessions. That combination is why I would recommend them for children aged 3 and up.
The AILIHEN I35. Its 3.5mm jack works with Chromebooks, tablets, Switch and most school-issued devices without pairing, and the inline HD microphone plus one-button control is easy for kids to use during virtual classes.
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