We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-02 · 7 min read · Independent comparison
If you want a child-safe wireless headphone with hard volume limits and a built-in audio share port, choose SIMOLIO Kids; if you need a wired studio headphone with a swiveling earcup, a coiled cable and a 6.35mm plug for real audio gear, choose OneOdio A71. These two are often thrown into the same shopping cart because both are 32-ohm over-ear designs with a share port and a 3.5mm jack — but that is where the overlap ends. One is a kids' Bluetooth headphone with a cable as a backup. The other is a wired monitoring tool that happens to fold and swivel.
• SIMOLIO Kids — biggest strength: Three physical volume limits (75/85/94dB) plus Bluetooth 5 wireless freedom and a 15-hour battery. That is parental control you can feel with a switch, not a menu.
• SIMOLIO Kids — biggest trade-off: It is a Bluetooth-first headphone. The 3.5mm jack exists, but the design leans on wireless and the share port works best with matching SIMOLIO sharing headphones.
• OneOdio A71 — biggest strength: Proper wired connectivity. A 6.35mm plug and a coiled 6.6–9.8 ft cord mean it plugs straight into amps, interfaces, keyboards and guitars without an adapter.
• OneOdio A71 — biggest trade-off: It has no battery, no microphone and no wireless mode. If your phone has no headphone jack, you are the one solving that problem.
• Who SIMOLIO Kids is for: Parents buying for a child who needs hearing-safe limits, wireless convenience and a travel case.
• Who OneOdio A71 is for: Adults doing studio monitoring, DJ work, mixing or instrument practice who want a cable, not a charge.
The SIMOLIO Kids headphone is built around one idea: a child's ears should not be able to get more volume than a parent allows. The 75/85/94dB switch is a physical control, which matters because a physical switch cannot be accidentally swiped past the way a software limit can. 75dB suits bedtime stories and sensitive hearing. 85dB covers homework, tablet time and everyday home use. 94dB is there for airplane cabins and noisy school buses, where you genuinely need more output to hear anything over the drone. That three-step ladder is the single most useful feature on this headphone.
Buy it if you are buying for a child, you want volume capped by default, you value the share port for two listeners, and you want the option to go wireless or wired. Skip it if you are an adult who needs a flat monitoring reference, a 6.35mm plug or a coiled cable that reaches across a desk to an amp. This is not that headphone, and it does not pretend to be.
OneOdio A71: Who It's For
The OneOdio A71 is a wired over-ear monitoring headphone, and the spec sheet says so plainly. The headline is the cable situation: a coiled cord that stretches from roughly 6.6 to 9.8 feet, terminating in a 6.35mm plug with a 3.5mm plug also included. That means it goes into an audio interface, a mixer, an amp, a keyboard, a guitar rig or a laptop without you hunting for an adapter in a drawer. If you have ever lost a 6.35mm-to-3.5mm adapter five minutes before a session, you understand why that matters.
The second genuinely useful feature is single-sided monitoring. The earcups swivel 90 degrees, so you can rotate one cup away and keep an ear free for the room — standard practice when you are cueing a track, tuning an instrument or working with someone else in the room. Add the shared audio port and a second pair can plug into yours, no splitter required, which is handy for two people reviewing the same mix.
On paper the A71 is loud and easy to drive: 32-ohm impedance with 110dB sensitivity, which is high, so phones, laptops and small interfaces will push it without strain. The frequency range is listed as 20Hz–20,000Hz (estimated), and the frequency response field notes 40KHz — a spec-sheet inconsistency worth knowing about rather than trusting blindly. The enclosure is plastic, the ear pads are padded for isolation and comfort, and the headband is adjustable and stretchable. It ships with a case, cable, manual and the headphones themselves. Warranty is listed as none, which is a real consideration if you are hard on gear.
Buy it if you are a musician, producer, DJ or podcaster who wants a cable-first headphone with proper connectors and a swiveling cup. Skip it if you need wireless audio, a microphone for calls and classes, or volume limiting for a child. The A71 has none of those.
• Best for young children → SIMOLIO Kids. The 75/85/94dB switch is the reason to buy it, and nothing on the A71 competes with that.
• Best for studio and instrument work → OneOdio A71. The 6.35mm plug, coiled cord and 90° swiveling cups are the exact features this job needs.
• Best for wireless listening → SIMOLIO Kids. Bluetooth 5, 10-meter range, 15-hour battery. The A71 has no wireless mode at all.
• Best for plugging into an amp, mixer or interface → OneOdio A71. No adapter required; the 6.35mm plug is included.
• Best for two people on one device → SIMOLIO Kids for families, OneOdio A71 for studio pairs. Both have a share port, but SIMOLIO's is aimed at siblings and classrooms while OneOdio's is aimed at a second pair of monitoring ears.
• Best for calls and online classes → SIMOLIO Kids. It has a built-in HD microphone; the A71 has no mic.
• Best for travel → SIMOLIO Kids. It includes a protective case and packs down for a backpack or suitcase; the A71 also includes a case but is a wired-only setup.
• Best for durability against kids → SIMOLIO Kids. Reinforced headband rated for bending and twisting. The A71's plastic build and absent warranty make it a worse fit for rough handling.
In my opinion, most people searching this comparison are buying for a child, and for them the SIMOLIO Kids is the clear pick — the physical volume switch, the microphone, the share port, the 15-hour battery and the case all line up with how families actually use headphones. I would only steer you to the OneOdio A71 if you are an adult doing music work, where the 6.35mm plug, coiled cable and swiveling earcups are the whole point and wireless is irrelevant. Decide which of those two people you are, and the choice makes itself.
how to use wired headphones without headphone jack
You need a 3.5mm-to-USB-C or 3.5mm-to-Lightning adapter, or a USB audio interface. The OneOdio A71 is wired-only, so it depends on your device having a 3.5mm output or an adapter. The SIMOLIO Kids sidesteps the issue entirely because it connects over Bluetooth and only uses the 3.5mm cable as a backup or for audio sharing.
how do i connect my wired headphones to my phone
Plug the 3.5mm plug into the phone's headphone jack. If your phone has no jack, use an adapter or a dongle that matches your phone's port. The OneOdio A71 includes both a 3.5mm and a 6.35mm plug, so it fits phones with a jack and larger audio gear directly.
how to make aux cable with headphones
You do not need to make one — both headphones already include a 3.5mm cable, and the SIMOLIO Kids uses that cable for its share-port function. For the A71, the included coiled cord runs roughly 6.6–9.8 feet and terminates in the plugs you need for computers, amps and mixers.
The SIMOLIO Kids, without question. It has adjustable 75/85/94dB volume limits, a built-in microphone, Bluetooth 5, a 15-hour battery and a reinforced headband built for rough use. The OneOdio A71 is wired-only with no microphone and no volume limiting, and it is aimed at adult studio and DJ use.
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