How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a purpose-built open-ear sports earbud with a secure earhook, multipoint pairing and an app that tailors the sound, choose Shenzhen SHOKZ OpenFit Air; if you need a jewelry-style clip-on ear cuff that doubles as a fashion accessory with longer total battery life, choose ERDU Magnetic Ear Cuff. Both are open-ear true wireless designs, so the real decision comes down to whether you prioritize fit engineering or styling flexibility.
• Shenzhen SHOKZ OpenFit Air — biggest strength: an engineered earhook fit (0.3 oz per bud) plus DirectPitch tuning, four microphones and multipoint pairing with two devices. Biggest trade-off: the case tops you out at 28 hours total, and there's no active noise cancellation.
• ERDU Magnetic Ear Cuff — biggest strength: a magnetic clip-on jewelry design with a mirror metal finish, three swappable accessories and 30 hours total battery life. Biggest trade-off: no listed companion app, no stated multipoint in the spec sheet, and no warranty listed.
• Both: open-ear, wireless Bluetooth, 20 Hz–20,000 Hz frequency range, USB-C charging, adult use, and both leave your ear canal open so you stay aware of traffic, coworkers and training partners.
• Best for workouts, calls and multi-device work: Shenzhen SHOKZ OpenFit Air.
• Best for style, gifting and all-day light wear: ERDU Magnetic Ear Cuff.
This is the more technically complete of the two. The open-ear concept here is built around an earhook that pivots behind the ear and stays put, and the whole bud weighs 0.3 oz. That matters more than it sounds: open-ear designs live or die on whether they wobble when you run, and an earhook is the most mechanically stable way to solve that. Shokz DirectPitch technology and tuning holes are the sound side of the same idea — precise, natural audio with minimal leakage, so the person next to you on the train isn't hearing your podcast.
Feature-wise, this is a workday tool as much as a workout tool. Four smart microphones handle call clarity, multipoint pairing holds two devices at once (laptop, phone, tablet — Android, iOS or Windows), and you switch between them with a tap. IP54 water resistance covers sweat and light rain. Battery is 6 hours per charge, 28 hours with the case, and a 10-minute top-up buys about 2 extra hours — the classic "I forgot to charge before the gym" save. Bluetooth 5.2 with roughly 33 feet of range, touch controls, and volume control round it out. The Shokz App adds multipoint management, EQ modes, customizable button functions and real-time power info, and the package includes the charging case, a protective case, a USB-C cable, a manual, and a 2-year warranty.
Buy it if you want one pair for runs, cycling, calls and switching between a laptop and a phone. Skip it if you specifically want jewelry aesthetics, need active noise cancellation (this has none), or you'd rather not deal with an app to unlock the full feature set.
The ERDU takes the opposite approach: instead of hiding the tech, it makes the tech the accessory. The buds have a mirror-finish metal body with 36-facet cubic zirconia detailing, and they attach with a strong magnetic clip-on structure rather than sitting in your ear. Three magnetic jewelry accessories come in the box, and you can snap them on and rotate them 360° to change the look. There's also a velvet pouch, which tells you how this product wants to be treated — as a gift, or as something you wear to dinner.
Comfort is the pitch: nothing enters the ear canal, so there's no in-ear pressure, and the magnetic hold is designed to stay put through commuting, walking and light workouts. IPX4 water resistance covers sweat and splashes, though not a downpour. Sound comes from a dynamic driver covering the same 20 Hz–20,000 Hz range as the Shokz, with minimal leakage and full awareness of your surroundings.
Battery is where the ERDU pulls ahead on paper: 5 hours per charge but up to 30 hours total with the case, fully charged in 1 hour, and a 5-minute quick charge gives about 1.5 hours of playback. Bluetooth 5.4 is the newer standard of the two, promising faster pairing and a stable connection, and it works with laptops too. The spec sheet lists active noise cancellation as the noise control type and media controls on the bud itself. Worth noting honestly: there's no app, no listed multipoint, and the warranty description simply says "No."
Buy it if you want earbuds that look like earrings, you're buying a gift, or you want the longest total battery life in this comparison. Skip it if you need guaranteed warranty coverage, app-based EQ, or you're a heavy sweater planning serious training sessions — IPX4 is light-duty protection.
• Best for secure fit during running and gym work → Shenzhen SHOKZ OpenFit Air. The pivoting earhook and 0.3 oz weight are built specifically to stay put.
• Best for calls and meetings → Shenzhen SHOKZ OpenFit Air. Four smart microphones are listed for call clarity; the ERDU sheet says nothing about microphone count.
• Best for switching between laptop and phone → Shenzhen SHOKZ OpenFit Air. Multipoint with two devices plus app-based management.
• Best for style and gifting → ERDU Magnetic Ear Cuff. Mirror finish, cubic zirconia detailing, three magnetic accessories, 360° rotation and a velvet pouch.
• Best for newer Bluetooth → ERDU Magnetic Ear Cuff. Bluetooth 5.4 against 5.2.
• Best for water resistance → Shenzhen SHOKZ OpenFit Air. IP54 versus IPX4.
• Best for warranty peace of mind → Shenzhen SHOKZ OpenFit Air. A 2-year warranty is listed; the ERDU sheet lists none.
• Best for app-based personalization → Shenzhen SHOKZ OpenFit Air. EQ modes, custom buttons and firmware updates.
My Verdict
In my opinion, the Shenzhen SHOKZ OpenFit Air is the safer buy for most people, because it's the more complete product: a fit designed for movement, four microphones, multipoint, an app, IP54 and a 2-year warranty. The ERDU Magnetic Ear Cuff is the better pick if you want your earbuds to look like jewelry, you're giving a gift, or you simply want the longer 30-hour total runtime — just go in knowing there's no app, no listed multipoint and no listed warranty. If you're genuinely torn, ask yourself one question: are these for training and calls, or for wearing? Training and calls, go Shokz. Wearing, go ERDU. Either way, check the current price on Amazon before you commit, since that's the one variable that can flip this decision.
how to wear tws earbuds
It depends on the design. For the Shenzhen SHOKZ OpenFit Air, you place each bud above the ear and pivot it backward until it sits snugly on the earhook. For the ERDU Magnetic Ear Cuff, you simply clip the magnetic cuff onto your ear without inserting anything into the canal.
how to use tws earbuds
Both pairs are wireless and pair over Bluetooth — Bluetooth 5.2 on the Shokz, 5.4 on the ERDU. Take them out of the case, pair once with your phone or laptop, then use the touch or media controls on the buds themselves. The Shokz additionally supports multipoint pairing with two devices at once through its app.
how to operate tws earbuds
The Shokz uses touch controls with volume control and customizable button functions you can set in the Shokz app. The ERDU uses media controls on the earbud, and you can also rotate its magnetic jewelry accessories 360° to change how the cuff sits and looks.
how to open tws earbuds
Neither of these is a case you "open" like a lid-only shell — both come with a charging case, and you lift the buds out to use them and drop them back in to charge. The Shokz also ships with a separate protective case, while the ERDU includes a velvet storage pouch for carrying.
If you want a fit engineered for movement, calls and multi-device work, choose Shenzhen SHOKZ OpenFit Air; if you need jewelry styling, gifting appeal and the longest total battery life, choose ERDU Magnetic Ear Cuff.
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