We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-08 · 6 min read · Independent comparison
If you want to fix the fit and seal on the TWS earbuds you already own for pc listening, choose AZLA SednaEarfit Crystal; if you need to protect a pair of JBL Endurance Race buds from drops and scratches, choose WUNIAK Case.
• AZLA SednaEarfit Crystal — biggest strength: German LSR silicone that grips and seals, so you keep the sound you already like while blocking more outside noise.
• AZLA SednaEarfit Crystal — biggest trade-off: It is a tip kit, not a product. If your earbuds are already comfortable and sealed, you gain little.
• WUNIAK Case — biggest strength: Soft silicone shell with carabiner, lanyard and cleaning pen that protects one specific model without blocking the charging port.
• WUNIAK Case — biggest trade-off: It only fits the JBL Endurance Race TWS. It does nothing for sound, fit or battery.
• Who each one is for: AZLA is for anyone chasing better isolation and a more secure fit; WUNIAK is for Endurance Race owners who want cheap, practical armor.
Think of this as a tuning-free upgrade. The tips are molded from hypoallergenic German liquid silicone rubber, and the material itself is the whole point. LSR has a naturally grippy surface, so the tip stays put instead of slowly working its way loose while you move. If you have ever pushed an earbud back in mid-song, that sticky surface is the fix.
The second thing it does is seal. A better acoustic seal means more passive isolation — less traffic, less office chatter, less fan hum from the tower next to your desk. Crucially, AZLA frames this as isolation without altering the original sound signature. You are not buying more bass or a different tuning; you are buying a quieter background so the tuning you already chose comes through better. For anyone running extra bass wireless headphones for pc, that matters, because a leaky seal is exactly what kills bass response.
Fit is the other half. The tips come in multiple sizes built around an ultra-short 4 mm core, which is what lets them sit deep in a wide range of TWS earbuds without pushing the bud out of its charging case. Sizes run from SS up through ML, so there is room to experiment. Compatibility is broad but specific: they work with Beats Powerbeats Pro and Powerbeats Pro 2, with Galaxy Buds 2, Buds and Buds+, and with plenty of other true wireless models.
Who should skip it? Anyone whose earbuds already fit perfectly and seal well. Also skip if you own Galaxy Buds Pro, Galaxy Buds Live or AirPods Pro — those are explicitly not compatible. And if you want a case, this is not one.
This is a single-purpose accessory done properly. It fits the JBL Endurance Race TWS and nothing else — WUNIAK says so plainly, and that honesty saves you a return. If you own that model, the shell is soft, elastic silicone with a special oil-spray finish that resists fingerprints and dust, so it does not turn into a lint magnet in your bag.
Protection is the job: scratches, bumps, shock and slip. A silicone sleeve will not survive a car crash, but it will absorb the everyday abuse of a gym bag, a backpack pocket or a desk drawer. The metal carabiner clips to a backpack strap, a belt loop or a keychain, and there is a lanyard in the box too, which is the simplest way to stop a small case from vanishing.
Two details show real thought. First, a sticky double-sided adhesive pad holds the buds in the case so they do not tumble out when you open it on the move. Second, you can charge with the cable without pulling the cover off — a small thing that becomes a daily annoyance on cases that get it wrong. You also get a cleaning pen, which is genuinely useful for the mesh and vents on sport earbuds.
Who should skip it? Anyone who does not own JBL Endurance Race TWS. This is not a universal case, and it will not fit AirPods, Galaxy Buds or Beats. Skip it too if you want a hard shell — this is soft silicone, and it is built for bounce, not crush resistance.
• Best for sound isolation → AZLA SednaEarfit Crystal. The acoustic seal is the entire design goal.
• Best for fit security during workouts → AZLA SednaEarfit Crystal. The grippy LSR surface keeps tips planted.
• Best for protecting your earbuds → WUNIAK Case. Scratches, bumps, shock and slip are all covered.
• Best for carrying convenience → WUNIAK Case. Carabiner, lanyard and a charging-port cutout you never have to remove.
• Best for long desk sessions → AZLA SednaEarfit Crystal. Hypoallergenic silicone is aimed at comfort over hours, not minutes.
• Best if you own JBL Endurance Race TWS → WUNIAK Case. It is made for that model and that model only.
• Best if you own Beats Powerbeats Pro, Powerbeats Pro 2 or Galaxy Buds 2 / Buds / Buds+ → AZLA SednaEarfit Crystal. Those are named compatible fits.
• Best for value on a single small purchase → depends on your problem. One solves fit and seal, the other solves protection. Neither replaces the other.
In my opinion, most people reading this should buy the AZLA SednaEarfit Crystal. Fit and seal are the two things that quietly ruin true wireless listening, and a tip kit attacks both for a wide spread of popular buds — including the ones people use with microphone gaming headphones for pc and deep bass ear clip headphones for pc. The WUNIAK Case is a good buy, but only if you specifically own the JBL Endurance Race TWS and want to keep it looking new. If that is you, it is a sensible, well-considered shell. Everyone else: fix the fit first. Check the current price on Amazon before you commit, since both are small purchases and the math is easy to run.
how to connect tws earbuds
Put the buds in your ears and they usually power on and enter pairing mode automatically; if not, hold the touch panel until the light flashes. Then open your phone or PC Bluetooth menu, find the model name and tap it. If a bud was previously paired to something else, it may connect there first, so turn that device's Bluetooth off.
how to pair tws earbuds
Pairing is the same one-time step as connecting: get the buds into pairing mode, then select them from your device's Bluetooth list. Once paired, they reconnect automatically whenever both are powered and in range. If pairing fails, delete the old entry from your device list and start again.
how to reset tws earbuds
Most true wireless models reset by holding both buds' touch panels for several seconds until the indicator flashes a distinct pattern, then releasing. That clears stored pairings so you can start fresh. Because the exact gesture varies by brand, check your specific model's manual before assuming it is broken.
how to tws earbuds
Once paired, true wireless earbuds work like any Bluetooth headphones: they auto-connect when removed from the case and pause when one is taken out. For PC use, set them as the output device and, if they have a mic, as the input device too. Tip fit matters here — a proper seal from something like the AZLA kit keeps bass and isolation consistent.
• HyperX CloudX Stinger 2 vs Turtle Beach Atlas 200
• YouthWhisper Open Ear Bone vs 1Mii Y8+
• our EPOS PC 7 vs Yealink UH35: Wired Headset pick
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.