We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 6 min read · Independent comparison
If you want a simple, low-impedance wired in-ear with a punchy dual-driver setup and a passive-seal fit, choose KZ ZST Pro Dynamic; if you need a wireless open-ear pair that translates between 165 languages in real time while you take calls and listen to music, choose QYGCKJ ERAZER XF23.
• KZ ZST Pro Dynamic — biggest strength: A hybrid dual-driver, wired design with a very low 18-ohm impedance and high 120 dB/mW sensitivity, so it's easy for a phone to drive. It also keeps things minimal: a 1.2 m cable, an L-shaped 3.5 mm plug, and a rounded silicone tip.
• KZ ZST Pro Dynamic — biggest trade-off: It's strictly wired and bare-bones. No Bluetooth, no microphone on this version ("Black Without Mic"), no translation, no app — just plug in and listen.
• QYGCKJ ERAZER XF23 — biggest strength: It's a 4-in-1 wireless device: real-time translation across 165 languages, music playback, phone calls, and a shared two-person translation mode, all over Bluetooth 5.4 with 16 mm dynamic speakers.
• QYGCKJ ERAZER XF23 — biggest trade-off: It's an open-ear, feature-dense gadget, not a sealed, isolating monitor. Its value is in translation and wireless convenience, not in blocking out the world.
• Who each is for: Pick the KZ ZST Pro Dynamic if you want a no-fuss wired listening earphone; pick the QYGCKJ ERAZER XF23 if you travel, work across languages, or want wireless audio with built-in translation.
The KZ ZST Pro Dynamic is the more traditional of the two — a wired in-ear headphone built around a hybrid dual-driver arrangement. The numbers that matter here are its 18-ohm impedance and 120 dB/mW sensitivity. In plain terms, that combination means it doesn't demand much power to get loud, so a phone, laptop, or portable media player can drive it without a separate amp. The frequency response spans 20 Hz to 20 kHz, which is the standard full-range window, and the spec sheet calls out that "driver performance is tough, bass bursts are more powerful" — a hint that low-end punch is part of the tuning intent.
In my opinion, this is a good fit for someone who wants a straightforward plug-and-play earphone: a 3.5 mm L-type jack, a 1.2 m cable, and a rounded silicon tip that the brand frames as its "independent patent technology." The L-shaped plug is a practical detail — it sits flatter against a phone in a pocket. It also ships in a black leatherette carrying case, which is a nice touch for tossing in a bag. The whole package is light, around 0.06 kg for the earphones themselves.
Who should skip it? Anyone who wants wireless freedom, a built-in microphone for calls, or any kind of smart feature. This is the "Black Without Mic" version, so there's no mic on the cable. It's also a passive-noise-cancellation design, meaning it relies on the tip sealing in your ear to keep sound out — it won't actively cancel noise. If you need Bluetooth or translation, this isn't the one.
The QYGCKJ ERAZER XF23 is a completely different animal. It's a wireless, open-ear set of earbuds whose headline feature is real-time AI translation across 165 languages. The brand positions it as a "4-in-1" tool: translation, music, calls, and live conversation. There's a shared design that lets two people wear the same device and talk in different languages, plus multiple translation modes — binaural translation, free-talk mode, a headphones-plus-phone mode, and a standalone translation-machine node. The brand cites an accuracy rate of up to 98% and mentions built-in encryption to protect your data.
For audio, it uses 16 mm dynamic speakers with a 360° Hi-Fi stereo claim and "well-balanced mids, expansive soundstage, crystal-clear highs." Connectivity is Bluetooth 5.4, which the brand says gives faster, more stable links with low delay to a phone, laptop, or any Bluetooth device. On the design side, it's an open-ear, ergonomic fit meant for all-day comfort without ear strain — the kind of shape that suits travel, work, and everyday wear. The brand also markets it as a gift and mentions sports and exercise use.
Who should buy it? Travelers, people in multilingual workplaces or meetings, language learners, and anyone who wants wireless audio without sealing their ears. Who should skip it? If you mainly want the most isolating, budget-minded wired listen and don't care about translation or Bluetooth, the extra complexity here is probably overkill. Note the XF23 is heavier as a package (listed at 6.7 ounces), and it's open-ear by design — so it won't block outside noise the way a sealed in-ear will.
• Best for wired, no-battery listening → KZ ZST Pro Dynamic. A 3.5 mm L-type jack and 1.2 m cable mean nothing to charge.
• Best for wireless freedom → QYGCKJ ERAZER XF23. Bluetooth 5.4 connects to phones, laptops, and other Bluetooth devices.
• Best for translation and travel → QYGCKJ ERAZER XF23. 165 languages, real-time modes, and a shared two-person design.
• Best for easy-to-drive sound from a phone → KZ ZST Pro Dynamic. 18-ohm impedance and 120 dB/mW sensitivity keep it undemanding.
• Best for calls and music in one wireless device → QYGCKJ ERAZER XF23. It covers phone calls and playback alongside translation.
• Best for a sealed, isolating fit → KZ ZST Pro Dynamic. The rounded silicone tip and passive noise cancellation lean on a physical seal.
• Best for open-ear, all-day comfort → QYGCKJ ERAZER XF23. Its ergonomic open-ear shape avoids plugging up your ear canal.
• Best for a simple, minimalist kit → KZ ZST Pro Dynamic. One pair of earphones in a leatherette case, nothing more.
If I had to pick one for the widest range of modern use, I'd buy the QYGCKJ ERAZER XF23. In my opinion, its combination of Bluetooth 5.4, 16 mm speakers, and 165-language real-time translation makes it the more versatile tool for travel, work, and language learning — it replaces a handheld translator and a wireless headset at once. That said, if your priority is pure, uncomplicated wired listening with a bass-forward, easy-to-drive in-ear and zero charging, the KZ ZST Pro Dynamic is the smarter, simpler choice. Match the pick to how you'll actually use it, and check the current price on Amazon before deciding.
FAQ
how to fit in ear headphones
For the KZ ZST Pro Dynamic, the fit depends on the rounded silicone tip sealing your ear canal — a proper seal is what gives you the passive noise cancellation and fuller bass. For the QYGCKJ ERAZER XF23, it's an open-ear design, so it rests at the ear rather than plugging the canal; adjust it until it's secure and comfortable for all-day wear.
Keep the silicone tips on the KZ ZST Pro Dynamic clean, since a waxy or clogged tip weakens the seal and muddies the sound. Wipe the earphone bodies and cable with a dry cloth, and never soak the drivers. For the QYGCKJ ERAZER XF23, wipe the open-ear sections gently and keep the charging area dry.
how to open in ear headphones
Neither product needs to be "opened" to use. The KZ ZST Pro Dynamic works as soon as you plug its 3.5 mm L-type jack into a phone, computer, or portable media player. The QYGCKJ ERAZER XF23 is wireless — pair it over Bluetooth 5.4 with your phone or laptop and it's ready.
how to ear headphones
Getting the best sound is mostly about placement. On the wired KZ ZST Pro Dynamic, seat the rounded tip so it seals the canal for stronger bass and isolation. On the QYGCKJ ERAZER XF23, position the open-ear arm so the 16 mm speaker sits just outside the canal, keeping you aware of your surroundings while still hearing music and calls.
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