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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 sweat-resistant, gym-ready pair of 40mm driver headphones with a wired 3.5mm backup and a low-latency gaming mode, choose Amazon Renewed TREBLAB Z2; if you need maximum battery life, the strongest noise cancellation and modern Bluetooth 6.1 with LDAC, choose Edifier W820NB.
• Amazon Renewed TREBLAB Z2 — biggest strength: a sport-first design with IPX4 sweatproofing, aptX over Bluetooth 5.0, a 65ms gaming mode and a 3.5mm jack, all built around neodymium-backed 40mm dynamic drivers.
• Amazon Renewed TREBLAB Z2 — biggest trade-off: the listed warranty is a 90-day limited one, and it tops out at Bluetooth 5.0 with a 20 kHz frequency ceiling, so it is the older, less feature-rich platform of the two.
• Edifier W820NB — biggest strength: up to 88 hours of playtime (49 with ANC on), -49 dB hybrid ANC, LDAC Hi-Res audio, Bluetooth 6.1 multipoint and a 40mm titanium driver.
• Edifier W820NB — biggest trade-off: no wired 3.5mm jack — its only wired option is USB-C — and there is no IP rating listed for sweat or water resistance.
• Who each pick is for: the Z2 suits exercisers and wired-connection holdouts; the Edifier suits commuters, travellers and desk workers who want long battery and deep noise cancellation.
This is a headphone designed around movement. The spec sheet leans hard into sport: IPX4 sweatproofing, "super soft" ear pads that are meant to hold their shape under a run, and a foldable build that ships with a rubberised plastic carrying case measuring about 6.5 by 3.54 by 8.07 inches. If you have ever had a pair of over-ears slide around mid-workout, the oval memory-foam pads and the leather-and-plastic frame here are clearly aimed at fixing exactly that.
The audio side is built on 40mm dynamic drivers with neodymium magnets, 32 ohm impedance, 93 dB sensitivity and a 20 Hz–20,000 Hz range, fed over Bluetooth 5.0 with aptX. There is also a 65 millisecond gaming mode, which is genuinely useful if you want the sound to keep pace with on-screen action, and cVc 6.0 call noise cancellation for voice pickup. Battery is rated at 35 hours, with a 3-hour full charge and a short top-up that TREBLAB says delivers a couple of hours of playback — handy right before a session.
Who should buy it: gym-goers, runners, and anyone who wants a 3.5mm jack as a fallback when the battery dies. Who should skip it: if you fly a lot and want the deepest possible noise cancellation, or you want the newest Bluetooth codec stack, the Z2's Bluetooth 5.0 platform and 90-day limited warranty are the honest limitations. Also worth knowing: this is a renewed unit, so it is a previously owned product that has been inspected and repackaged rather than a brand-new retail box.
The W820NB Plus Gen 2 is the opposite personality: a do-everything commuter and desk headphone. Its headline number is battery — up to 88 hours of continuous use, dropping to 49 hours with ANC engaged, with a 2-hour charge time and a fast-charge claim of 15 hours of playback from a 15-minute top-up. For anyone who resents charging cables, that is the whole argument in one line.
Noise cancellation is the other pillar. Edifier rates it at -49 dB of hybrid ANC with multiple modes you can cycle through using physical buttons, plus extra scenario presets (sport, office, travel) in the Edifier ConneX app. The 40mm dynamic driver is a titanium-coated unit with 40 ohm impedance and a 20 Hz–40 kHz frequency range, and it supports LDAC Hi-Res audio over Bluetooth 6.1 with multipoint. There is also spatial sound, app-based EQ presets, a volume guard for capping loudness, and AI-based call noise cancellation.
Build-wise it is a lightweight, foldable over-ear at 247 g in navy plastic, with soft memory foam cushions. The catch: the only wired connection is USB-C, so there is no analogue 3.5mm option, and no IP rating is listed. Who should buy it: commuters, frequent flyers, home-office workers and students who want long battery, strong ANC and modern codecs. Who should skip it: heavy sweaters and gym users who need an official water-resistance rating and a 3.5mm jack.
Side-by-Side: Which Should You Choose?
• Best for battery life → Edifier W820NB. Up to 88 hours (49 with ANC) against 35 hours on the Z2.
• Best for workouts and sweat → Amazon Renewed TREBLAB Z2. IPX4 sweatproofing, sport-tuned fit and secure memory-foam pads.
• Best for wired flexibility → Amazon Renewed TREBLAB Z2. A 3.5mm jack means it works with in-flight systems, older gear and dead-battery situations; the Edifier is USB-C only.
• Best for hi-res audio and modern codecs → Edifier W820NB. LDAC, Bluetooth 6.1, multipoint and a 40 kHz frequency ceiling versus Bluetooth 5.0, aptX and 20 kHz.
• Best for low-latency gaming → Amazon Renewed TREBLAB Z2. Its 65 ms gaming mode is a specific, listed feature; the Edifier sheet lists no latency figure.
• Best for travel portability → Edifier W820NB. At 247 g and foldable, it is the lighter, more packable of the two.
• Best for warranty peace of mind → Edifier W820NB. A 1-year warranty against the Z2's 90-day limited coverage, a direct consequence of the renewed route.
In my opinion, the Edifier W820NB is the better buy for most people. The combination of 88-hour battery, -49 dB hybrid ANC, LDAC Hi-Res audio, Bluetooth 6.1 multipoint and a 1-year warranty covers commuting, travel and desk work in one pair, and the 40mm titanium driver gives it the more modern audio platform. I would only steer you to the Amazon Renewed TREBLAB Z2 if sweat resistance and a 3.5mm jack are non-negotiable for you — that is where it genuinely wins, and its 65ms gaming mode is a nice bonus. Everyone else gets more headphone for their money with the Edifier.
what is 40mm driver in headphones
A 40mm driver is the diameter of the speaker unit inside the earcup — 40 millimetres across. Both headphones here use a 40mm dynamic driver, so the size matches; what differs is the material and tuning, with the Z2 using neodymium-backed drivers and the Edifier using a titanium-coated unit.
is 40mm driver good for headphones
Yes — 40mm is a common, well-rounded size for over-ear headphones. It is large enough to move decent air for bass and loudness while keeping the cups reasonably light. Both the TREBLAB Z2 and the Edifier W820NB use 40mm drivers, so neither is disadvantaged on this spec.
which driver is best for headphones
There is no single "best" driver size — it depends on tuning, materials and the enclosure. Here, both are 40mm dynamic drivers, but the Edifier adds a titanium coating and a wider 20 Hz–40 kHz range, while the TREBLAB runs 20 Hz–20,000 Hz. In my opinion the Edifier's driver spec is the more capable of the two on paper.
what are 40mm drivers in headphones
They are the speaker components that convert electrical signal into sound, measured at 40mm in diameter. In the TREBLAB Z2 they are paired with 32 ohm impedance and 93 dB sensitivity; in the Edifier W820NB they are paired with 40 ohm impedance. Both are dynamic drivers, the most common type in over-ear headphones.
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