We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-23 · 7 min read · Independent comparison
If you want the more versatile everyday hybrid ANC earbuds with deeper noise reduction and a much longer total runtime, choose TOZO NC9; if you need ultra-light sleep-first earbuds built for side sleepers that still cut noise with hybrid ANC, choose Ertuly T33.
• TOZO NC9 biggest strength: Hybrid ANC rated to a 45dB reduction depth, six-mic ENC calling, 10mm drivers with OrigX Acoustic 2.0, IPX8 water protection, and up to 60H total playtime (ANC off) with an LED battery display.
• TOZO NC9 biggest trade-off: It's a standard in-ear bud rather than a sleep-specific design, so it isn't purpose-built for side sleeping the way the T33 is.
• Ertuly T33 biggest strength: A sleep-first build — roughly 3g per bud, an ultra-thin shape for side sleepers, a four-tap Sleep Mode that mutes alerts and blocks accidental touches, and hybrid ANC rated to block up to 98% of noise.
• Ertuly T33 biggest trade-off: Lower total battery ceiling (up to 48H with the case) and a shorter 10m Bluetooth range versus the NC9's 20m.
• Who each pick is for: Choose the TOZO NC9 for commuting, calls, workouts and all-day listening; choose the Ertuly T33 if you mainly want earbuds you can wear in bed and on the move without pressure.
The NC9 is the more feature-dense of the two, and it leans into that. Its hybrid ANC is rated to a maximum noise reduction depth of 45dB, which is the kind of figure you want when you're trying to erase engine drone on a bus or the hum of an open-plan office. Pair that with a Transparency Mode and you get both ends of the spectrum: seal the world out when you need focus, let it back in when you're crossing a street or waiting for a platform announcement.
Where it pulls ahead for a lot of people is the everyday stuff. Six microphones with ENC work to filter background noise on calls, which matters if you take meetings from a cafe or a shared space. The 10mm dynamic drivers and OrigX Acoustic 2.0 tuning are aimed at deep bass with clarity, and the TOZO app gives you 32 EQ options plus a sharing zone if you like to tinker with your sound. There's also a 60ms latency figure, which is the sort of spec that matters for gaming and video sync.
Battery is the other headline. You get up to 60H total with ANC off and 40H with ANC on, or 14H and 10H respectively per single charge, with a full charge in about 1.5 hours and an LED display on the case so you can see where you stand. IPX8 protection plus a nano-coating covers sweat, rain and splashes. Six sizes of replaceable earcaps and an ergonomic in-ear shape round it out.
Ertuly T33: Who It's For
The T33 is built around one job and does it deliberately: sleeping. Each bud weighs roughly 3g and uses an ultra-thin, lightweight shape specifically aimed at side sleepers, so there's no pressure point when your ear is against a pillow. That's the detail that separates it from a general-purpose bud — most in-ears simply aren't shaped for that.
Its noise cancellation is still hybrid ANC, using dual microphones to actively neutralize up to 98% of disruptive sound — snoring, traffic, appliance hum. A triple-tap switches between ANC and Transparency Mode. Then there's Sleep Mode: four quick taps mutes all alerts and blocks accidental touches, so a stray brush against the pillow doesn't pause your audio or trigger a voice assistant at 3 a.m.
Away from the bedroom it holds up as a normal pair of earbuds. The 13mm dynamic drivers deliver balanced sound with rich bass, IPX6 protects against sweat and water, and Bluetooth 6.0 handles stable low-latency connections within 10m with auto-pairing when you open the case. Call quality comes from ENC microphones, and you can hold a single button to answer, end or reject calls. You can also use either bud independently in single mode.
Battery runs up to 8 hours per charge and up to 48 hours total with the case, recharging in about 1.5 hours over USB-C, with an LED indicator on the case. A one-year warranty is listed.
Buy it if sleep, side-sleeping comfort and a barely-there fit are your priorities, or if you want a small bud for travel and light workouts. Skip it if you want the maximum noise-reduction depth, the longest total runtime, or the widest Bluetooth range — the NC9 wins those on paper.
• Best for maximum noise reduction depth → TOZO NC9. A 45dB maximum reduction depth is the more aggressive spec of the two.
• Best for sleep and side sleepers → Ertuly T33. Roughly 3g per bud, an ultra-thin shape, and a Sleep Mode that mutes alerts and blocks accidental touches.
• Best for total battery life → TOZO NC9. Up to 60H total with ANC off and 40H with ANC on, versus up to 48H total on the T33.
• Best for calls in noisy places → TOZO NC9. Six microphones with ENC is the heavier call-focused setup.
• Best for workouts and wet weather → TOZO NC9. IPX8 is the higher water-protection rating here; the T33 carries IPX6.
• Best for sound tweaking → TOZO NC9. The app offers 32 EQ options and a sharing zone.
• Best for a lighter, smaller fit → Ertuly T33. The sleep-first design is the more minimal of the two.
• Best for newer Bluetooth and instant pairing → Ertuly T33. Bluetooth 6.0 with auto-pairing on case open, though range is 10m versus the NC9's 20m.
If I were buying one pair for the widest range of situations, I'd take the TOZO NC9. In my opinion, the combination of a 45dB hybrid ANC rating, six-mic ENC calling, IPX8 protection, and up to 60H total playtime makes it the more complete everyday earbud — it's the one I'd reach for on a commute, a call, or a workout. The Ertuly T33 is the better answer if sleep is the whole point: nothing in the NC9's spec sheet is aimed at side-sleeping comfort the way the T33's roughly 3g, ultra-thin build is. So: NC9 for all-round use, T33 for the pillow. Check the current price on Amazon before you decide, since that's the one thing that can tip a close call.
FAQ
what is hybrid anc earbuds
what is anc earbuds
ANC stands for Active Noise Cancellation: the earbuds actively generate sound to cancel out incoming noise rather than just physically blocking it with a seal. It's most effective on steady low-frequency sounds like engine drone, traffic and appliance hum — which is exactly the kind of noise the T33 lists as its target.
what are hybrid anc earbuds
They're earbuds that combine outward- and inward-facing microphones for noise cancellation, which usually gives better performance across a wider range of frequencies than a single-microphone ANC design. In this pair, the NC9 pairs its hybrid ANC with a Transparency Mode, and the T33 pairs its hybrid ANC with a triple-tap switch to Transparency.
what are anc earbuds
ANC earbuds are in-ear headphones with active noise cancellation built in, often alongside features like Transparency Mode, ENC call microphones and app-based EQ control. The NC9 and T33 both fit that description — the NC9 leaning toward all-day use and calls, the T33 toward sleep and side-sleeping comfort.
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See also: TOZO Hybrid Active Noise vs Generic Earbuds, hybrid anc earbuds, TOZO T21 vs CCA KZ AS16: IN Ear Earbuds