We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-17 · 7 min read · Independent comparison
If you want to protect a pair of AirPods Max you already own and keep them looking new, choose X-Synapse Silicone Case Cover; if you need a complete set of wireless earbuds with noise cancelling, a touch-screen charging case and long battery life, choose Thunelec Earbuds. These two products sit in completely different categories, so the right answer comes down to what you're actually trying to buy.
• X-Synapse Silicone Case Cover — biggest strength: A genuine 4-in-1 protection kit (ear pad covers, headband cover, clear TPU ear cup covers, top cover) that adds protection without adding bulk.
• X-Synapse Silicone Case Cover — biggest trade-off: It's an accessory only. It protects AirPods Max; it doesn't produce sound, charge anything, or work with any other headphone.
• Thunelec Earbuds — biggest strength: A full-featured audio product — Bluetooth 5.4, up to 45dB ANC, 48-hour total battery with the case, IPX7 waterproofing and a color touch screen on the charging case.
• Thunelec Earbuds — biggest trade-off: They're in-ear buds, not over-ear headphones, and there's a stated limitation — no direct volume control on the buds themselves, so you adjust volume via the case screen or your device.
• Buy the X-Synapse cover if you already own AirPods Max (2024 or 2020) and want to guard against scuffs, sweat and dust.
• Buy the Thunelec Earbuds if you want a standalone listening device for commuting, calls, workouts and travel.
This is a straightforward accessory, and it's honest about that. The X-Synapse cover is a 4-in-1 kit: a pair of silicone ear pad covers, a silicone headband cover, a pair of clear TPU ear cup covers, and a silicone top cover. It's built for the Apple AirPods Max in both the 2024 and 2020 releases, and it's cut to work with the newer USB-C charging port on the 2024 model. The materials are silicone and thermoplastic polyurethane — soft, light, and thin by design, so the point is protection that doesn't change how the headphones feel on your head.
The practical case for it is simple: AirPods Max are expensive over-ear headphones with fabric and metal surfaces that pick up fingerprints, dust, sweat and the occasional knock. This kit wraps the parts that take the most abuse — the ear pads, the headband, the ear cups and the top — in a layer that's anti-fingerprint, anti-scratch, dustproof, sweatproof and waterproof. The cutouts line up with the buttons and ports, installation needs no tools, and X-Synapse states the covers don't interfere with low power mode when the headphones go into the Smart Case. That last detail matters, because a bulky skin that blocks the Smart Case would defeat the purpose.
Who should buy it: anyone who owns AirPods Max, uses them daily, and wants to keep them looking clean — commuters, desk workers, gym-goers who sweat in them, or anyone who's already nicked a pair and doesn't want a repeat. The gradient orange color is a style choice; if you want a stealth look, this isn't it.
Who should skip it: anyone who doesn't own AirPods Max. The cover is compatible only with AirPods Max (2024/2020), so it's useless for any other headphone. Also skip it if you want your headphones to look completely stock — even the clear TPU pieces change the surface feel. And if you're shopping for a listening device rather than protection, this isn't a product at all in that sense. One more note: the AirPods Max themselves are not included, so this is purely the cover set.
The Thunelec U9 is a genuinely loaded set of true wireless earbuds. Start with the core numbers: Bluetooth 5.4 for connectivity, active noise cancellation rated up to 45dB that Thunelec says blocks around 90% of ambient distractions, and environmental noise cancellation (ENC) on the mic side to keep your voice clear on calls. Battery life is 6–8 hours per charge, extending to 48 hours total with the charging case, and the case itself refills in about 1.5 hours. There's a smart indicator showing battery level, which is the kind of small thing that prevents mid-commute surprises.
The standout design feature is the charging case's full-color touch screen. Instead of digging for your phone, you can control playback, switch tracks, take calls and toggle noise cancelling right on the case. It also handles 7-language switching, wallpaper customization, screen brightness, a headphone-find function and a timer. Be aware of the stated limitation: the earbuds themselves don't support direct volume control — you adjust volume on the case screen or the connected device.
Sound is handled by 14.2mm bio-carbon fiber dynamic drivers, with bass reaching down to 50Hz and five EQ modes (standard, classic, jazz, rock, pop) so you can tune for music, video or calls. The fit is in-ear with three sizes of silicone tips (S/M/L), and IPX7 waterproofing means sweat, rain and splashes aren't a concern — useful for gym sessions and wet commutes. Transparency mode lets outside sound in when you need awareness, which is the safer choice on city streets.
Who should buy it: commuters, remote workers on calls all day, gym-goers, travelers, and anyone who wants one pair of earbuds to cover music, calls and workouts. Compatibility is broad — iOS, Android, tablets, laptops and smart TVs — and Thunelec backs it with a 30-day refund window and a 2-year warranty.
Who should skip it: anyone who prefers over-ear headphones, or who wants physical buttons rather than touch controls. And if volume control directly on the bud matters to you, note that limitation before deciding.
• Protecting existing AirPods Max → X-Synapse Silicone Case Cover. It's the only one of the two that does this job.
• Listening to music or taking calls → Thunelec Earbuds. The cover makes no sound; the earbuds are the actual audio product.
• Best for battery life → Thunelec Earbuds. 6–8 hours per charge and up to 48 hours total with the case.
• Best for noise control → Thunelec Earbuds. Up to 45dB ANC plus ENC for calls, and a transparency mode.
• Best for workouts and rain → Thunelec Earbuds. IPX7 waterproofing and a secure in-ear fit with three tip sizes. The X-Synapse cover is also sweatproof and waterproof, but it protects rather than performs.
• Best for keeping gear looking new → X-Synapse Silicone Case Cover. Anti-fingerprint, anti-scratch and dustproof, with cutouts aligned to the buttons and ports.
• Best for travel and commuting → Thunelec Earbuds if you need audio on the move; X-Synapse if you're packing AirPods Max and want them shielded in the bag.
• Easiest setup → both. The cover needs no tools and the earbuds pair with a single tap.
In my opinion, most shoppers searching these two names together are actually deciding between "protect what I have" and "buy something new to listen with" — and those aren't competing answers. If I already owned AirPods Max, I'd buy the X-Synapse Silicone Case Cover, because a 4-in-1 silicone and TPU kit that stays slim, keeps the Smart Case working and blocks fingerprints and scuffs is cheap insurance on expensive headphones. If I didn't own AirPods Max and just wanted earbuds, I'd buy the Thunelec U9, because Bluetooth 5.4, 45dB ANC, 48-hour total battery, IPX7 and a touch-screen case cover far more ground per purchase. My pick for the average buyer: Thunelec Earbuds. Check the current price on Amazon before you commit, since that's the one thing that can flip this call.
Yes. X-Synapse lists compatibility with AirPods Max (2024/2020), including the USB-C charging port on the 2024 release, with cutouts aligned to the buttons and holes.
Yes. They combine up to 45dB active noise cancellation with ENC for clearer calls, plus a transparency mode for hearing your surroundings. Both are switchable.
They're not really comparable — the X-Synapse is a protection accessory for headphones you already own, while the Thunelec is a complete audio product. Judge value by what you need, and check the current price on Amazon for each.
Not directly on the buds. Thunelec states volume is adjusted via the charging case's touch screen or your connected device.
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