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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a tough, lightweight shell that keeps your on-ear headphones safe between meetings, choose WERJIA Hard Carrying Case; if you need the actual on-ear headphones you'll wear during those meetings, choose Moondrop Old Fashioned 40mm. These two products sit at opposite ends of the same hobby — one is a hard EVA storage shell, the other is a wired open-back on-ear headphone. That's the first thing to get straight before anything else.
• WERJIA Hard Carrying Case — biggest strength: a hard EVA shell with soft interior protection, sized to fit JBL Tune 520BT, 510BT, 500BT and T450BT on-ear headphones, plus a compact, lightweight build that's easy to toss in a bag.
• WERJIA Hard Carrying Case — biggest trade-off: it's the case only. No headphones, no cables, no accessories. Buy it expecting to protect gear you already own.
• Moondrop Old Fashioned 40mm — biggest strength: a 40mm dynamic driver, an open-back soundstage design, and a modular detachable build with a 0.78mm 2-pin interchangeable cable.
• Moondrop Old Fashioned 40mm — biggest trade-off: it's wired, has no noise control at all, and the open-back design leaks sound both ways — not something you'd want in a shared office.
• Who each pick is for: WERJIA for anyone who already owns a compatible JBL on-ear pair and wants to stop crushing it in a backpack. Moondrop for listeners who want an open, airy on-ear sound and don't mind a cable.
The WERJIA case is a single-purpose product, and it's honest about that. It's a hard EVA shell — EVA being the same foamy, semi-rigid material used in a lot of protective cases — with a soft interior that cradles whatever you put inside. The stated job is straightforward: protect your device from bumps, dents and scratches. There's nothing clever here, and that's the point.
Where it earns its keep is sizing and portability. The internal size is 7.5 by 2 inches, which is the kind of footprint that swallows a folded on-ear headphone without much wasted space. It's listed as compatible with the JBL Tune 520BT, 510BT, 500BT and T450BT, so if you own one of those, you already know whether this fits. The whole thing weighs about 0.23 kg, and the design brief is explicitly "compact and lightweight" for travel and home storage. In practice that means it slides into a backpack or carry-on without becoming the heaviest thing you packed.
One more thing worth being clear about: this is a storage product, not a tech product. There are no electronics, no battery, no audio. It's a shell. Judge it on the shell.
Moondrop Old Fashioned 40mm: Who It's For
The Moondrop Old Fashioned 40mm is the interesting one. It's a wired on-ear headphone built around a 40mm dynamic driver with a high damping coefficient diaphragm and a three-layer rigid-flex composite diaphragm, tuned specifically for an open-back soundstage. Open-back means the earcups aren't sealed — air moves freely, which typically produces a wider, more natural sense of space than a closed design. It also means sound leaks out and ambient noise leaks in. That's the trade you're making.
The spec sheet backs up the retro-classical positioning. Frequency response is listed at 20Hz–32kHz, with an effective range of 20Hz–20kHz, impedance of 32 ohms, sensitivity of 109dB/Vrms at 1kHz, and total harmonic distortion at or below 0.2% at 94dB and 1kHz. Those are the kind of numbers that suggest an efficient, easy-to-drive headphone — 32 ohms and 109dB sensitivity generally means a phone or laptop dongle can push it without much effort. No amp required, in my read of those figures.
The build is where it gets genuinely distinctive for this price bracket (check the current price on Amazon — I'm not quoting one). The headband telescopes, the hinges are multi-axis swivel, and the earcups and headband are designed to be detachable entirely. The cable is a 0.78mm 2-pin interchangeable design, and the box includes the headphone, cable, manual and certificate, with a 1-year warranty. Moondrop ships it in silver with circular earcups, and the driver is listed as a dynamic type.
Side-by-Side: Which Should You Choose?
• Best for protecting headphones you already own → WERJIA Hard Carrying Case. Hard EVA shell, soft interior, 7.5 x 2 inch internal space.
• Best for actual listening → Moondrop Old Fashioned 40mm. It's the only one of the two that makes sound.
• Best for travel and bag storage → WERJIA. Compact, lightweight, roughly 0.23 kg, built for exactly this.
• Best for open, spacious sound → Moondrop. Open-back design plus a 40mm driver tuned for soundstage.
• Best for cable flexibility → Moondrop. The 0.78mm 2-pin interchangeable cable and detachable earcups and headband make it repairable and customizable.
• Best for quiet shared spaces → WERJIA, oddly enough. It's silent by nature. The Moondrop leaks sound because open-back is the whole point.
• Best for meeting calls → neither, strictly speaking. The case is silent and the Moondrop has no mic and no noise control. If you want the best volume limiting wireless headphones for meetings, that's a different category entirely.
• Best for a JBL Tune 520BT/510BT/500BT/T450BT owner → WERJIA, since those are the listed compatible models.
These aren't really competitors, so my recommendation splits cleanly. If you already own a compatible JBL on-ear pair and you want it to survive your commute and your meetings without dents, I'd buy the WERJIA Hard Carrying Case — it's a focused product that does one job with no pretense. If you want headphones to actually listen through, I'd buy the Moondrop Old Fashioned 40mm, because the 40mm driver, open-back tuning, detachable cable and modular build give you far more to work with. My honest pick for most readers reading a headphone comparison: the Moondrop, with the WERJIA as a sensible add-on if you own compatible JBL cans.
FAQ
No. It's a wired headphone with a 3.5mm stereo plug and a 0.78mm 2-pin detachable cable. There's no noise control listed and no wireless connectivity, so it isn't a meeting-call headset.
Based on the listed specs — 32 ohms impedance and 109dB/Vrms sensitivity — it should be easy to drive from a phone, laptop or dongle. Those numbers point to an efficient headphone rather than a power-hungry one.
They do different jobs, so value depends on what you need. The case protects gear you already own; the Moondrop is the gear itself. Check the current price on Amazon for both and compare against your actual use case rather than the sticker.
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