If you want compact in-ear noise control and adjustable sound for study, choose TOZO NC9; if you need over-ear headphones with a stated 48-hour battery life, choose Wentronic Y04. For focused desk sessions, I’d lean toward the NC9: it combines active noise cancellation with a way to let outside sound back in when you need it. The Y04 makes more sense if you prefer an over-ear fit and want fewer battery-life interruptions.
TOZO NC9 vs Wentronic Y04 at a Glance
• TOZO NC9 strength: Active noise cancellation, transparency mode, and app-based sound adjustment. Trade-off: In-ear fit may not suit someone who dislikes earbuds.
• Wentronic Y04 strength: Over-ear construction, foldable design, and a stated 48-hour battery life. Trade-off: The listed features do not include a transparency mode or app-based sound presets.
• TOZO NC9 is for: Study sessions where you want to switch between reducing surrounding noise and hearing more of it.
• Wentronic Y04 is for: Listeners who prefer over-ear headphones and value extended stated battery life.
• The short version: Choose based on fit and listening controls, not on an assumed difference in sound quality; the available specifications don’t establish which one sounds better.
The NC9’s strongest study feature is its combination of active noise cancellation and transparency mode. ANC is intended to reduce background sound; transparency mode lets outside sound through so you can hear what is happening around you without removing the earbuds. That makes the NC9 more adaptable when a study session includes both quiet concentration and moments when you need to notice a conversation or announcement.
It also offers 32 preset modes through the TOZO app, letting you adjust the sound profile to your preference. The earbuds use Bluetooth 5.3, pair automatically after you take them from the case, and have built-in microphones with noise reduction for calls. For battery planning, the product information states over 13 hours of playback from a single charge and 27 extra hours from the case; in ANC mode, it states over seven hours of playback. These figures describe different use conditions, so the ANC figure is the more relevant one if you expect to keep that feature active.
I’d choose the NC9 if you want in-ear headphones with several listening modes and app-based sound options. I’d skip it if you prefer the feel of over-ear headphones, or if you specifically want an open-ear or bone-conduction design. Its transparency mode is not the same thing as an open-ear build: the earbuds still sit in the ear.
The Y04 is an over-ear Bluetooth headphone with active noise cancellation and a foldable structure. That format may appeal if you would rather have headphones around your ears than earbuds inside them. Folding can also make the headset easier to pack into a bag than a fixed over-ear design, though the provided information does not give folded dimensions or a carrying case.
Its clearest numerical advantage is the stated 48-hour battery life. It also has Bluetooth 5.3 and a 3.5 mm jack, giving it both wireless connectivity and a wired connection option. The description says its large dynamic drivers are intended to produce balanced audio across bass, vocals, and treble; that is a stated design goal, not a basis for claiming it will sound better than the NC9.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-22 · 12 min read · Independent comparison
• Best for switching between noise reduction and hearing your surroundings → TOZO NC9. It has both ANC and transparency mode; the Y04’s listed controls and features do not include a comparable mode.
• Best for longer stated battery life → Wentronic Y04. Its listed battery life is 48 hours. The NC9 lists over 13 hours per charge, plus 27 extra hours from its case, with over seven hours in ANC mode.
• Best for app-based sound adjustment → TOZO NC9. The app provides access to 32 preset modes. No equivalent Y04 app feature is listed.
• Best if you prefer over-ear headphones → Wentronic Y04. Its ear placement is over-ear; the NC9 is an in-ear earbud.
• Best if you want a wired listening option → Wentronic Y04. It includes a 3.5 mm jack, alongside Bluetooth.
• Best for a compact earbud setup → TOZO NC9. It comes with a wireless charging case, while the Y04 is a foldable over-ear headset. The available details don’t provide enough information to compare their packed dimensions.
• Best for calls based on listed microphone features → TOZO NC9. Its product information specifically describes multiple microphones and voice-noise reduction. The Y04 details provided here do not describe a call-microphone feature.
• Best for a child-focused purchase → Neither is an automatic pick. The Y04 is identified for adults, and the NC9’s information does not provide a child-specific fit or age recommendation. Fit and comfort would need careful consideration.
I’d buy the TOZO NC9 for study because its ANC, transparency mode, and app sound presets give me more ways to adapt one pair to changing surroundings. That recommendation is about its listed features, not a claim that it blocks more noise or sounds better than the Y04.
I’d choose the Wentronic Y04 instead if I wanted an over-ear fit, a 3.5 mm jack, and its stated 48-hour battery life. For my study use, the NC9’s option to let outside sound in is the more useful distinction.
I’d pick the NC9 if you want ANC plus transparency mode and app-based sound presets. I’d pick the Y04 if you prefer over-ear headphones or place more weight on its stated 48-hour battery life.
The Y04 lists 48 hours of battery life. The NC9 lists over 13 hours from a single charge, 27 extra hours from its case, and over seven hours in ANC mode; these figures use different stated conditions, so they aren’t a direct one-number comparison.
The NC9 has a transparency mode designed to let outside sound in. The supplied Y04 information lists ANC but does not describe a transparency mode, so I wouldn’t assume it offers the same feature.
No. The NC9 is an in-ear earbud, and the Y04 is an over-ear headphone. If you specifically want an open-ear or bone-conduction design for study, look for a different type of product.
Dale
Neither is an open-ear design, and neither uses bone conduction. If you’re searching for open ear earbuds for study or the best bone conduction headphones for study, these two aren’t a match for that style. The choice here is between TOZO’s in-ear features and Wentronic’s foldable over-ear format.
TOZO NC9 vs Wentronic Y04 at a Glance
• TOZO NC9 strength: Active noise cancellation, transparency mode, and app-based sound adjustment. Trade-off: Its in-ear fit may not suit someone who dislikes earbuds.
• Wentronic Y04 strength: Over-ear construction, a foldable design, and a stated 48-hour battery life. Trade-off: The listed features don’t include transparency mode or app-based sound presets.
• TOZO NC9 is for: Study sessions where you want to switch between reducing surrounding noise and hearing more of it.
• Wentronic Y04 is for: Listeners who prefer over-ear headphones and value its stated battery life.
• The short version: Choose based on fit and listening controls, not an assumed difference in sound quality. The available specifications don’t establish which one sounds better.
The NC9’s standout study feature is its combination of active noise cancellation and transparency mode. ANC is intended to reduce background sound; transparency mode lets outside sound through so you can notice what is happening around you without removing the earbuds. That could be useful when a study session includes both quiet concentration and moments when you need to hear someone nearby.
It also offers 32 preset modes through the TOZO app, so you can adjust the sound profile to your preference. The earbuds use Bluetooth 5.3, pair automatically after you take them from the case, and have microphones with noise reduction for calls. The product information states over 13 hours of playback from a single charge and 27 extra hours from the case; in ANC mode, it states over seven hours. The ANC figure is the more relevant one if you expect to keep that feature on.
I’d choose the NC9 if you want in-ear headphones with several listening modes and app-based sound options. I’d skip it if you prefer over-ear headphones or specifically want an open-ear or bone-conduction design. Transparency mode is not the same as an open-ear build: the earbuds still sit in the ear.
The Y04 is an over-ear Bluetooth headphone with active noise cancellation and a foldable structure. That format may appeal if you’d rather have headphones around your ears than earbuds inside them. Folding can make the headset easier to pack than a fixed over-ear design, though the available product details don’t give folded dimensions or mention a carrying case.
Its clearest numerical advantage is its stated 48-hour battery life. The Y04 also has Bluetooth 5.3 and a 3.5 mm jack, giving it wireless and wired connection options. Its product description says the large dynamic drivers are designed for balanced audio across bass, vocals, and treble. That is a stated design goal, not proof that it sounds better than the NC9.
I’d consider the Y04 for longer stretches away from a charger or when an over-ear fit is simply more appealing. The trade-off is that the supplied details don’t list a transparency mode or sound-customization app. If your study routine involves hearing a roommate or announcement without removing your headphones, that difference may matter. The listed age range is adult, so it isn’t the obvious choice for someone seeking the best kids headphones for study.
Side-by-Side: Which Should You Choose?
• Best for longer stated battery life → Wentronic Y04. It lists 48 hours. The NC9 lists over 13 hours per charge, 27 extra hours from its case, and over seven hours in ANC mode.
• Best for app-based sound adjustment → TOZO NC9. Its app provides access to 32 preset modes. No equivalent Y04 app feature is listed.
• Best if you prefer over-ear headphones → Wentronic Y04. Its ear placement is over-ear; the NC9 is an in-ear earbud.
• Best if you want a wired listening option → Wentronic Y04. It has a 3.5 mm jack as well as Bluetooth.
• Best for an earbud setup with a charging case → TOZO NC9. It comes with a wireless charging case, while the Y04 is a foldable over-ear headset. The supplied information doesn’t give enough detail to compare their packed dimensions.
• Best for calls based on the listed microphone features → TOZO NC9. Its product information describes multiple microphones and voice-noise reduction. The Y04 details don’t describe a call-microphone feature.
• Best for a child-focused purchase → Neither is an automatic pick. The Y04 is identified for adults, and the NC9 information doesn’t provide a child-specific fit or age recommendation.
My Verdict
I’d buy the TOZO NC9 for study because ANC, transparency mode, and app sound presets give me more ways to adapt to changing surroundings. That recommendation is about its listed features, not a claim that it blocks more noise or sounds better than the Y04.
I’d choose the Wentronic Y04 instead if I wanted an over-ear fit, a 3.5 mm jack, and its stated 48-hour battery life. For my study use, the NC9’s option to let outside sound in is the more useful distinction.
I’d pick the NC9 if you want ANC plus transparency mode and app-based sound presets. I’d pick the Y04 if you prefer over-ear headphones or put more weight on its stated 48-hour battery life.
The Y04 lists 48 hours. The NC9 lists over 13 hours from a single charge, 27 extra hours from its case, and over seven hours in ANC mode. These figures use different stated conditions, so they aren’t a direct one-number comparison.
The NC9 has a transparency mode designed to let outside sound in. The supplied Y04 information lists ANC but doesn’t describe a transparency mode, so I wouldn’t assume it offers the same feature.
No. The NC9 is an in-ear earbud, and the Y04 is an over-ear headphone. If you specifically want an open-ear or bone-conduction design for study, look for a different type of product.
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