We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 6 min read · Independent comparison
If you want a cheap, practical fix for worn-out or lost silicone tips on your existing JBL TWS earbuds, choose JNSA Replacement Earbuds Tips; if you need a complete pair of true-wireless earbuds with deep bass, a gaming mode and a charging case, choose Midcomsys Air 31.
• JNSA Replacement Earbuds Tips — biggest strength: six pairs of soft silicone tips in three sizes (S/M/L), shaped to fit straight into the charging case of several JBL TWS models, so you keep the buds you already own.
• JNSA Replacement Earbuds Tips — biggest trade-off: it is an accessory only. There are no electronics here — no drivers, no battery, no Bluetooth. If your earbuds are dead, these tips won't revive them.
• Midcomsys Air 31 — biggest strength: a full TWS package: Bluetooth 5.3, dynamic drivers, active noise cancellation, touch controls, a gaming/low-latency mode, Type-C charging and up to 24 hours of playback with the case.
• Midcomsys Air 31 — biggest trade-off: it's an all-in-one product, so it's a bigger commitment than a set of tips, and you're locked into whatever sound and fit the earbuds themselves deliver.
• Who each pick is for: JNSA for JBL Tune/Vibe/Free X owners who only need replacement tips; Midcomsys for anyone who needs working TWS earbuds from scratch, especially gamers and commuters.
The JNSA kit is a maintenance item, and that's the whole point. It's built for people who already own a pair of JBL in-ear true-wireless buds — specifically the Tune 230NC TWS, Tune 125TWS, Tune 130NC TWS, Vibe 200TWS and Free X — and whose original silicone tips have torn, gone missing, or stopped sealing properly. The listing also notes compatibility with other JBL TWS in-ear models that use the same eartip shape, so it's worth a quick visual check against your own buds before ordering.
What you get is six pairs total: two pairs each in small, medium and large. That's the practical part. Most people don't know their size until they try a few, and having a spare pair of the size that finally works means you're not back to square one the next time one rolls under the sofa. The material is soft silicone, described as elastic, reusable and durable — the usual reason silicone beats foam here, since it wipes clean and doesn't crumble over time.
The detail I'd highlight most is the "fit in case" design. Because the tips are shaped to sit inside the charging case, you can drop the earbuds back in without pulling tips off first — which is exactly the annoyance that makes some aftermarket tips a bad idea. JNSA also positions them as helping reduce outside noise and tighten up perceived sound quality, which is a fair claim for any tip that seals better than a stretched-out original.
Midcomsys Air 31: Who It's For
The Air 31 is a complete pair of TWS earbuds, and the spec sheet reads like it was written for two audiences at once: music listeners and gamers. On the audio side you get dynamic drivers, 32-ohm impedance, a claimed deep-bass tuning with clear highs, and active noise cancellation with touch controls. On the gaming side there's a dedicated ultra-low-latency mode for audio that stays in sync with what's on screen — the feature mobile players actually notice.
Connectivity is Bluetooth 5.3, which is the current mainstream standard and generally means faster pairing and a more stable link than older versions. The microphone is described as HD with noise reduction, aimed at calls and in-game chat, so if you take meetings or squad up while wearing them, that's the relevant part of the spec.
Battery is the headline number: up to 24 hours of playback when you count the charging case, with roughly an hour of charge time over Type-C. In real terms, that's a week or two of commute-sized listening sessions between top-ups, or a long trip without hunting for a socket. The housings are in-ear, made from plastic and silicone, black, and the design is described as ergonomic and lightweight — the fit that matters for workouts and long sessions.
Who should skip it: anyone who just needs new tips for JBL buds they already like. Buying a whole second pair of earbuds to solve a 20-minute fit problem is overkill. And if you specifically want a jacked, wired connection, note there's no headphone jack — Bluetooth only.
Side-by-Side: Which Should You Choose?
• Best for keeping the earbuds you already own → JNSA Replacement Earbuds Tips. It's the definition of a targeted fix.
• Best for battery life → Midcomsys Air 31. Up to 24 hours of playback with the case; the JNSA kit has no battery at all.
• Best for fit experimentation → JNSA Replacement Earbuds Tips. Six pairs across S/M/L lets you find your seal without buying three separate products.
• Best for gaming → Midcomsys Air 31. The low-latency gaming mode is the whole reason that product exists in this form.
• Best for calls → Midcomsys Air 31. It has an HD noise-reduction mic; the JNSA tips have no microphone.
• Best for case convenience → JNSA Replacement Earbuds Tips — but only in the sense that they're designed to stay on inside a JBL charging case. The Air 31's case is a battery, not a tip holder.
• Best for low-commitment spending → JNSA Replacement Earbuds Tips. Accessories like this are almost always the smaller outlay; check the current price on Amazon for both before you decide.
In my opinion these two products barely compete — they solve different problems, and the "right" one depends entirely on what's already in your drawer. If you own compatible JBL Tune, Vibe or Free X earbuds and the only thing wrong is the silicone, I'd buy the JNSA Replacement Earbuds Tips: three sizes, six pairs, and a shape that stays put in the case is exactly what that job needs. If you don't own working TWS earbuds, I'd buy the Midcomsys Air 31 — Bluetooth 5.3, active noise cancellation, a gaming mode and up to 24 hours with the case is a far more complete answer. My pick for most readers starting from nothing is the Air 31.
how to connect tws earbuds
Take both earbuds out of the charging case and they power on and enter pairing mode. On your phone, open Bluetooth settings, find the earbud name in the list and tap it. The Midcomsys Air 31 uses Bluetooth 5.3, which is designed for quick, stable pairing.
how to pair tws earbuds
Pairing means linking the earbuds to your device, and it's a one-time step per device. Once the Air 31 appears in your Bluetooth list and you select it, your phone remembers it and reconnects automatically next time. If it doesn't show up, make sure the earbuds are out of the case and charged.
how to reset tws earbuds
A reset clears the saved pairing so you can start fresh, usually by clearing the earbud entry from your phone's Bluetooth list and re-pairing. The exact button combination varies by model, so follow the manufacturer's instructions for your specific earbuds. The Air 31's touch controls handle playback and calls, not a documented reset sequence.
how to tws earbuds
"TWS" stands for true wireless stereo — two separate earbuds with no wire between them. To use them, charge the case, take the buds out, pair over Bluetooth, and use the touch controls for playback. The Air 31 adds a low-latency gaming mode and active noise cancellation on top of that basic routine.
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