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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-05 · 6 min read · Independent comparison
• erjigo in-Ear Earbuds Headphones — biggest strength: a 10mm high-polymer diaphragm driver, a 20Hz–40kHz frequency range, and a 34Ω/105dB spec that rewards a decent source with a wide, natural soundstage for long webinar sessions.
• erjigo in-Ear Earbuds Headphones — biggest trade-off: it ships without a mic, so it's a listening-first pick, not a talk-first one.
• NALMOPG TRN MT1 — biggest strength: a dual-magnet driver (roughly 1T flux, ~55% more magnetic flux) plus a 5μm silicon-crystal biocellulose diaphragm that's easy to drive at just 22Ω/106dB.
• NALMOPG TRN MT1 — biggest trade-off: a narrower 20Hz–20kHz range and a no-mic build, so it also leans toward monitoring and listening rather than calling.
• Who each pick is for: erjigo for the listener who wants a wide, bass-driven Hi-Res presentation; TRN MT1 for the buyer who wants a lightweight, secure, easy-to-drive monitor.
The erjigo in-Ear Earbuds Headphones (model CRA) are built around a 10mm high-polymer diaphragm dynamic driver. The design brief here is clear: professional acoustic tuning aimed at a natural soundstage and a bass-driven signature. With a 20Hz–40kHz frequency range, it reaches well past the 20kHz ceiling most consumer earbuds stop at, and the spec sheet calls out vocals and instruments as the focus. In my opinion, that combination is what makes it feel like a "sit back and listen" pair rather than a monitoring tool.
Who should buy it: someone who spends a lot of time listening — webinar audio, lectures, music, video — and wants a wide, bass-forward presentation with a comfortable, stable fit and a cable that won't turn into a knot in your bag. It also suits anyone who prefers a 2-pin detachable setup for future cable swaps.
Who should skip it: anyone who needs to talk. This version is explicitly the without-mic model, so if you're the one presenting on a webinar and need to speak, you'll want a separate mic or a different pair. Also skip it if you want the absolute easiest-to-drive earbud — 34Ω is still efficient, but it's higher than the TRN's 22Ω.
NALMOPG TRN MT1: Who It's For
The NALMOPG TRN MT1 is the more technically ambitious design on paper. Its 10mm dynamic driver uses a dual-magnet structure that the manufacturer says boosts magnetic flux by around 55%, approaching 1T, which they tie to better resolution, dynamics and speed. The diaphragm is a 5μm silicon-crystal composite biocellulose unit, and the claim is that it's about twice as efficient as a conventional biocellulose diaphragm — meaning it's easier to drive. That matters if you're plugging straight into a laptop or phone.
The numbers back up the "easy to drive" story: 22Ω impedance and 106dB sensitivity. It covers 20Hz–20kHz, uses a 3.5mm jack, a 2-pin connector with gold-plated contact pins, and a 1.25m+5cm cable. Weight is listed at 8.2g for the earbuds plus 12g for the cable — genuinely light. The shell is shaped around the human ear for long wear, and the over-ear hook design is meant to keep the earbuds locked in place while improving comfort and sound isolation. The improved 2-pin connector is designed to protect the contact pins from accidental breakage. Color is Emerald.
Who should buy it: someone who wants a light, secure, over-ear monitor that's easy to drive from a laptop or phone, values a replaceable 2-pin cable, and wants solid isolation for focused listening. It's a natural fit for long webinar marathons where the earbuds need to stay put.
Who should skip it: anyone who needs an inline mic — this is also the no-mic version. And if you specifically want a frequency range beyond 20kHz, the erjigo reaches higher on paper.
• Best for wide frequency range → erjigo in-Ear Earbuds Headphones (20Hz–40kHz vs 20Hz–20kHz).
• Best for easy driving from a laptop or phone → NALMOPG TRN MT1 (22Ω/106dB vs 34Ω/105dB).
• Best for secure, locked-in fit during long sessions → NALMOPG TRN MT1 (over-ear hook, 8.2g earbuds + 12g cable).
• Best for bass-driven, bass-forward listening → erjigo in-Ear Earbuds Headphones (bass-driven tuning, 10mm high-polymer diaphragm).
• Best for cable durability and tangle resistance → erjigo in-Ear Earbuds Headphones (flat OFC double-line parallel cable).
• Best for connector longevity → NALMOPG TRN MT1 (improved 2-pin with gold-plated contact pins).
• Best for a metal-and-resin, jewelry-like build → erjigo in-Ear Earbuds Headphones (metallic surface housing, resin cavity, White).
• Best for anyone who needs to talk on the call → neither as-is; both are no-mic models, so budget for a separate mic.
If I had to pick one for a webinar-heavy routine, I'd buy the NALMOPG TRN MT1. In my opinion, the 22Ω/106dB spec and the over-ear hook design make it the more practical all-day companion for webinars — it's light, stays put, and drives easily from whatever you're already using. The erjigo is the better pure listening pick if you want that wide 40kHz range and a bass-forward signature, but the TRN's dual-magnet driver, easy load, and secure fit tip it for me. Either way, check the current price on Amazon before deciding, since that's the one variable I can't speak to.
No. Both the erjigo in-Ear Earbuds Headphones and the NALMOPG TRN MT1 are the no-mic versions. If you're presenting on webinars and need to speak, you'll need a separate microphone or a different model.
The NALMOPG TRN MT1. At 22Ω and 106dB sensitivity, its 5μm biocellulose diaphragm is designed to be driven easily by smartphones and laptops. The erjigo runs at 34Ω/105dB, which is still efficient but a slightly heavier load.
The erjigo in-Ear Earbuds Headphones, at 20Hz–40kHz versus the TRN MT1's 20Hz–20kHz. Whether you hear the difference depends on your source and your ears, but on paper the erjigo reaches higher.
Yes, both use a 2-pin connector. The erjigo uses a 0.75mm 2-pin with a flat OFC cable; the TRN MT1 uses improved 2-pin connectors with gold-plated contact pins for better protection and stability.
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