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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 8 min read · Independent comparison
• 21X Earbuds — biggest strength: A full wireless feature set in one box — HiFi dynamic drivers, Active Noise Cancellation plus Transparency Mode, Bluetooth 5.3, touch controls, and a smart LED case that reports remaining battery for both the buds and the case.
• 21X Earbuds — biggest trade-off: Closed in-ear design. That's what makes the ANC work, but it also means you're sealed off from traffic, gym announcements and the people around you unless you switch to Transparency Mode.
• Middle Rabbit S6 — biggest strength: An open-ear hook that weighs just 7 grams, with a proper boom microphone and inline controls for volume and mute — a genuinely rare combination in open-design headsets.
• Middle Rabbit S6 — biggest trade-off: It's a wired 3.5 mm headphone with no noise cancellation and no battery of its own. It also openly admits it won't match in-ear bass. You'll need a headphone jack, or an adapter if your phone dropped it.
• Who each pick is for: 21X Earbuds suit anyone who wants untethered music, ANC and a charging case; Middle Rabbit S6 suits anyone who lives on calls, meetings or a call-center desk and wants their ears left open.
The 21X Earbuds are a classic true-wireless package — and the spec sheet reads like the brand tried to tick every box a student or commuter would care about. You get 13 mm dynamic drivers with a 20 Hz–20 kHz frequency range, 32 ohm impedance and 99 dB sensitivity, tuned for what the listing calls rich bass with detailed mids and crisp highs. On top of that sits Active Noise Cancellation and Environmental Noise Cancellation, plus a Transparency Mode you can flip on when you need to hear a platform announcement or a barista calling your name. In my opinion that ANC/Transparency pair is the single most useful feature here, because it's the thing that makes a sealed earbud livable in the real world.
Battery is the other headline. The buds themselves are rated for up to 10 hours per charge, and the case adds roughly another 30, for up to 40 hours total. The case has a 470 mAh battery, recharges in about an hour, and — this is the detail I like most — carries an LED display showing remaining power for the buds and the case separately. No guessing whether you're on your last 10 percent. Fast charging means a short top-up returns hours of listening. Bluetooth 5.3 covers up to about 33 feet (10 meters) with reduced latency, so streaming and casual gaming stay in sync, and one-step auto pairing means the buds connect as soon as you open the case.
Middle Rabbit S6: Who It's For
The Middle Rabbit S6 is a different animal entirely, and the product page is refreshingly honest about it: these are open-ear earbuds that do not go into your ear canal. The brand says outright that sound quality won't match in-ear earbuds — less bass, more open — but argues they're much safer for your hearing. That trade-off is the whole point of the design. The AirFlow open-ear structure delivers 360° ambient awareness, so traffic, gym instructions and coworkers' questions all come through while your audio plays. At 7 grams with soft silicone ear hooks, they're built to sit on your ear contour rather than press into it.
The S6's calling card is its extended boom microphone, which the brand notes is a rarity among open-design earbuds. If your day is meetings, voice calls or a call-center headset rotation, a mic that sits near your mouth is a completely different experience from an in-ear bud's built-in mic. Inline controls let you adjust volume, answer calls, and mute or unmute without touching your laptop — a small thing that matters a lot on back-to-back calls. Remember the listing's own tip: you have to turn the mic on. For audio, the S6 uses a 16.2 mm dynamic driver (the listing also references dual-layer 14.2 mm drivers and bio-membrane tech) with 20 ohm impedance, 98 dB sensitivity and a 20 Hz–20 kHz range, tuned for a more natural, open presentation than sealed buds.
There's no noise cancellation here — the spec sheet lists noise control as "None" — and no battery, because the S6 is wired with a 3.5 mm jack. That's a genuine limitation in 2026: plenty of phones no longer have a headphone jack, so you'd need an adapter. But for a PC, laptop, desk phone or gaming setup, a wired 3.5 mm headset is zero-fuss: no pairing, no charging, no latency. It ships with a manual and a one-year warranty. Buy the S6 if you take a lot of calls, want your ears open all day, and plug into a computer or a device with a headphone jack. Skip it if you want ANC, wireless freedom, or thumping bass for music.
Side-by-Side: Which Should You Choose?
• Best for noise cancellation → 21X Earbuds. ANC plus ENC is built in; the S6 has none.
• Best for battery life and untethered use → 21X Earbuds. Up to 10 hours per charge and up to 40 hours with the LED case, versus a wired connection that never needs charging.
• Best for staying aware of your surroundings → Middle Rabbit S6. Open-ear at 360° with 7 g of weight beats switching an ANC bud into Transparency Mode.
• Best for music and bass → 21X Earbuds. Sealed 13 mm drivers versus an open design the brand itself says is lighter on bass.
• Best for long-session comfort → Middle Rabbit S6. Silicone ear hooks and 7 g versus an in-ear seal you may need to reseat.
• Best for cross-device wireless convenience → 21X Earbuds. Bluetooth 5.3, one-step pairing, iOS and Android, phones, laptops and smart TVs.
• Best for a fixed desk setup → Middle Rabbit S6. A 3.5 mm plug means no pairing, no charging table, no dropouts.
If I had to pick one for myself, I'd buy the 21X Earbuds. In my opinion they cover far more of an average day — music, commuting, calls and noise blocking — in a single wireless package, and features like ANC, Transparency Mode and the LED battery display are the kind of things you use constantly rather than occasionally. The Middle Rabbit S6 is the smarter buy only if your life is genuinely call-centric and you'd rather keep your ears open; that boom mic is the reason to choose it. Decide which of those two describes you, then check the current price on Amazon before you commit.
FAQ
No. The spec sheet lists noise control as "None." Their open-ear design actually does the opposite: it keeps you aware of everything around you. If you want Active Noise Cancellation, the 21X Earbuds have it, along with a Transparency Mode for when you don't.
Only if your phone has a 3.5 mm headphone jack, or you use an adapter. The S6 is wired. The 21X Earbuds connect over Bluetooth 5.3 and work with iOS and Android phones, laptops and smart TVs.
The 21X Earbuds, by a wide margin in practical terms — up to 10 hours per charge and up to 40 hours total with the LED display case. The Middle Rabbit S6 is wired and draws no battery at all, but it also can't leave your device's side.
That depends on what you're solving for. If you want one wireless pair for music, calls and noise blocking, the 21X Earbuds pack more functions into a single purchase. If you mainly need a lightweight, open-ear headset for meetings, the S6 does that one job very well. Check the current price on Amazon for both and weigh it against which feature set you'll actually use.
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See also: Middle Rabbit D1 vs Avantree Relay & Voyager: APTX HD, SONY WH-CH520 vs Middle Rabbit TK01, Cillso Earbuds vs TELKRO Earbuds: LED Digital Display