How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want open-ear earbuds that keep you aware of your surroundings while you drive, run or work, choose TOZO OpenEarRing Open Ear; if you need a protective clear cover that keeps a Technics EAH-AZ100 charging case looking and staying pristine, choose kwmobile Earphones Case. These two products are not rivals in the usual sense — one is a complete audio system with a charging case, the other is a case for a charging case. But shoppers searching both names are usually asking the same underlying question: how should I protect and power my earbuds? Here is how I'd decide.
• TOZO's biggest strength: A full open-ear audio package — 40 hours of total playback with the charging case, Bluetooth 5.4, a digital LED display, 32 EQ modes and a 5.1g-per-bud clip-on fit built for glasses wearers.
• TOZO's biggest trade-off: It is an open-ear design, so it does not seal the ear canal the way in-ear buds do; and it is a bigger commitment than a simple accessory.
• kwmobile's biggest strength: Flexible, impact-resistant transparent TPU that hugs a Technics EAH-AZ100 charging case, with precise cutouts so the port and buttons stay usable.
• kwmobile's biggest trade-off: It protects a case — it makes no sound, holds no battery, and only fits the Technics EAH-AZ100.
• Choose TOZO if you actually need earbuds and want the charging case included.
• Choose kwmobile if you already own the Technics EAH-AZ100 and just want to keep its charging case scratch-free.
The TOZO OpenEarRing is the more complete product here by a wide margin. It is a set of true open-ear earbuds — each bud weighs just 5.1g — that clip onto your ear rather than plug into the canal. That design choice is the whole point: you hear your music and your surroundings at the same time. For driving, running, cycling or moving through a busy office, that awareness matters. TOZO also engineered the shape with glasses wearers in mind, using a skin-friendly silicone that is meant to sit alongside frames without clashing.
On the audio side, TOZO leans on its OrigX acoustic tech, a 10mm dynamic driver, a 20Hz–20,000Hz frequency range and 32-ohm impedance. Bluetooth 5.4 is claimed for a stable, low-latency connection with strong signal penetration. There is also app support: 32 preset EQ modes plus access to a large library of user-shared EQs, and adaptive noise cancellation with touch controls. The 60ms latency figure is reasonable for casual video and gaming.
Buy it if you want one purchase that covers earbuds, charging case, audio tuning and a secure open-ear fit for workouts, driving and glasses wear. Skip it if you need deep passive isolation in loud environments, or if you already own a favorite pair of earbuds and only need protection for them.
kwmobile Earphones Case: Who It's For
The kwmobile Earphones Case is a single-purpose accessory, and it is honest about that. It is a transparent TPU silicone cover made specifically for the Technics EAH-AZ100 charging case. Nothing more, nothing less. The value is in the material and the fit: soft, flexible TPU that stretches over the case snugly, tears less easily than a rigid shell, and adds grip so the case is less likely to slide out of your hand. At 20g it barely changes the feel of what you're carrying.
The cutouts are the detail that matters most day to day. A case cover is only useful if the charging port and buttons stay fully accessible, and kwmobile says the precise cutouts keep them that way. Because it is completely clear, the original charging case design still shows through — some people want that, since they bought the Technics case for how it looks. The impact-resistant, wear-resistant TPU is aimed at everyday bumps, keys in a bag, and the general scuffing that a pocket-carried case collects.
Buy it if you own the Technics EAH-AZ100, you want to keep its charging case clear of scratches and grime, and you like the look of a transparent cover. Skip it if you don't own that specific model, or if you're actually shopping for earbuds — this will not charge, play or hold any audio.
• Best for listening to music → TOZO OpenEarRing Open Ear. It's the only one of the two that produces sound.
• Best for battery life → TOZO OpenEarRing Open Ear. Up to 10 hours per charge and roughly 40 hours total with the charging case.
• Best for staying aware of traffic and surroundings → TOZO OpenEarRing Open Ear. The open-ear clip-on design leaves the ear canal open.
• Best for glasses wearers → TOZO OpenEarRing Open Ear. It was engineered with frames in mind and each bud weighs only 5.1g.
• Best for customizing sound → TOZO OpenEarRing Open Ear. 32 preset EQ modes plus a large library of shared EQs through the app.
• Best for protecting an existing charging case → kwmobile Earphones Case. Clear, flexible, impact-resistant TPU built for the Technics EAH-AZ100.
• Best for keeping a case's buttons and port usable → kwmobile Earphones Case. Precise cutouts keep everything accessible.
• Best for a low-commitment add-on → kwmobile Earphones Case. It's a lightweight 20g cover, not a new audio setup.
In my opinion, most people landing on this comparison should buy the TOZO OpenEarRing Open Ear. It is a complete, genuinely useful product: open-ear buds, a charging case with a digital display, 40 hours of total playback and app-based EQ. It solves a real problem — listening safely while staying aware. The kwmobile case is a good accessory, but only if you already own the Technics EAH-AZ100 and specifically want clear TPU protection for its charging case. If that's you, it's a sensible, tidy pick. If you're deciding where to spend, I'd put the money toward the earbuds and check the current price on Amazon before you commit.
how to charge earbuds case
On the TOZO OpenEarRing, you charge the case with the included USB-C (A to C) cable; the spec sheet lists a case charging time of about 1.8 hours. The kwmobile cover has a precise cutout for the charging port, so you can charge a Technics EAH-AZ100 case without removing the cover.
how to charge case without earbuds
A charging case charges independently of the earbuds — you plug the case into power with the USB-C cable and it tops up its internal battery. The TOZO case's digital LED display shows you the battery state so you can tell when it's charged. The kwmobile cover doesn't change this at all; it just leaves the port accessible.
how to charge jlab earbuds case
JLab cases are not covered by either product here, so I can't give you a JLab-specific answer from these spec sheets. The general idea is the same, though: use the case's own charging cable and port. Just note the kwmobile cover is made only for the Technics EAH-AZ100, not JLab.
how to charge apple earbuds case
Apple earbud cases aren't listed as compatible with the kwmobile cover either — it's built strictly for the Technics EAH-AZ100. For Apple, you'd use Apple's own case and cable. For the TOZO OpenEarRing, you use the included USB-C cable and the case's digital display to track charging.
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