How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a rugged, ready-to-travel home for your JBL Endurance Peak earbuds, choose Alltravel TWS Earbuds Case; if you need to rescue the sound and fit of earbuds you already own, choose PENON ePro EP01. These two cheap TWS accessories solve completely different problems — one is about storage and protection, the other is about sound and comfort — so the right pick depends entirely on what's bugging you right now.
• Alltravel TWS Earbuds Case — biggest strength: a semi-hard, water-resistant shell with an elastic strap and mesh pocket that keeps your JBL Endurance Peak charging case and cable together and protected.
• Alltravel TWS Earbuds Case — biggest trade-off: it's a case only, built specifically around JBL Endurance Peak 3, Peak 2 and Peak True models, and the earbuds themselves are sold separately.
• PENON ePro EP01 — biggest strength: a patented horn-shaped silicone eartip design that aims to improve noise isolation and squeeze more bass and clarity out of earbuds you already own.
• PENON ePro EP01 — biggest trade-off: it's a consumable accessory, not a device, and it only fits earphones with a nozzle diameter between 4.9mm and 7mm.
• Who each is for — pick the Alltravel case if your priority is protecting and organizing your JBL gear; pick the PENON ePro EP01 if your priority is upgrading how your existing earbuds sound and feel.
The Alltravel TWS Earbuds Case is a single-purpose product, and that's its charm. It's a palm-sized, compact carrying case in white with a striped pattern, measuring 4.5 x 3.25 x 1.5 inches and weighing just 1.8 ounces. The enclosure is silicone, and the shell type is described as hybrid, with a semi-hard construction that's meant to absorb pressure and knocks while resisting water. Inside, an elastic strap holds your charging case in place, and a mesh pocket keeps the charging cord and small accessories from scratching or tangling.
Who should buy it: anyone who owns one of those JBL models and wants a dedicated, protective home for the charging case and cable — especially if you travel, train, or just hate hunting for a loose cord. Who should skip it: anyone with a different brand of earbuds, since the fit is tailored to those JBL shapes. And remember — this is the protective case only. The device and accessories are sold separately, so it won't replace anything you don't already own.
PENON ePro EP01: Who It's For
The PENON ePro EP01 is a completely different kind of purchase: replacement silicone eartips, sold in a three-pair pack in the MLL size configuration. The headline feature is a patented horn-shaped nozzle design, and the silicone is doped with graphene. The claimed goal is to minimize sound loss through transmission, improve noise isolation, and let sound waves resonate and spread within the horn shape to amplify the voice. In practice, that translates to fuller bass, clearer vocals and preserved high-frequency detail — the kind of changes people chase when their stock tips feel thin or leaky.
Comfort is the other half of the pitch. The soft silicone is designed to reduce ear fatigue for long listening sessions, and the horn shape is meant to hold a snug, secure fit that stays put during movement — a real consideration for workouts. The tips are washable and flexible, so they're built to survive heavy use rather than being replaced constantly. The color is black, and the enclosure material is listed as graphene and silicone.
Here's the compatibility catch: the inner nozzle diameter is 4.7mm, and they fit earphone tubes from 4.9mm to 7mm. That range covers a lot of in-ear monitors, wired earphones and true wireless earbuds, but it isn't universal — measure your nozzle before buying. Also note the warranty description is simply "NO." Who should buy it: anyone whose earbuds fit that nozzle range and who wants better isolation, more low-end and less ear fatigue from cheap stock tips. Who should skip it: anyone with an out-of-range nozzle, or anyone expecting these to be a device rather than a wear-and-tear part.
• Best for protecting your gear → Alltravel TWS Earbuds Case. Semi-hard, water-resistant shell plus a one-year warranty.
• Best for improving sound → PENON ePro EP01. The horn-shaped, graphene-doped tips target isolation, bass and clarity.
• Best for travel organization → Alltravel TWS Earbuds Case. Elastic strap, mesh pocket and carabiner keep everything in one place.
• Best for long listening comfort → PENON ePro EP01. Soft silicone and a snug horn-shaped fit are aimed at reducing ear fatigue.
• Best for workouts → both, for different reasons. The case protects your JBL gear in transit; the EP01 tips stay stable in your ears during movement.
• Best for wide device compatibility → PENON ePro EP01. Fits 4.9mm–7mm nozzles across IEMs, wired earphones and TWS; the case fits only three specific JBL models.
• Best if you don't own JBL Endurance Peak earbuds → PENON ePro EP01. The case's fit is tailored, so it won't help you otherwise.
• Best if you want a one-time fix → Alltravel TWS Earbuds Case. The EP01 is a consumable part you'll likely buy again over time.
In my opinion, this comes down to the problem you actually have. If your JBL Endurance Peak charging case and cable are loose in a bag and you want them protected and organized, I'd buy the Alltravel TWS Earbuds Case — it's purpose-built for exactly that job, and the strap-and-mesh-pocket layout is the right answer for travel. If instead your existing earbuds sound thin or hurt after an hour, I'd buy the PENON ePro EP01, because new tips change how you hear what you already own. Two different fixes, two different buyers. Match the product to the annoyance.
FAQ
It's the category name for truly wireless earbuds that pair separately to your phone. That matters here because the PENON ePro EP01 is explicitly made to fit TWS earbuds and IEMs with 4.9mm–7mm nozzles, while the Alltravel case is built around JBL Endurance Peak TWS charging cases.
There's no single answer — true wireless earbuds range from budget to premium, and accessories like these two sit at the low end of that spectrum. Since prices change, check the current price on Amazon using the button on this page rather than relying on any fixed number.
Pairing is usually a matter of taking both buds out of the case and selecting them in your phone's Bluetooth menu. Once paired, a case like the Alltravel unit keeps the charging case and cable protected between uses, and tips like the EP01 keep the fit and seal consistent so the wireless connection has less competition from outside noise.
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.
See also: JBL Quantum 300 vs acer USB Headset: USB Wired Headphones, Xmenha Pink Open Ear vs Weihele Trucker, Snug Play+ Kids Headphones vs MHTEC 2-in-1, Yunseity Single Ear Earhook vs GOWENIC Earbuds