How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want earbuds you can actually lie on your side with and forget you're wearing, choose Xmenha Flat Invisible Sleep; if you need serious active noise cancelling, clear calls and app-tuned sound, choose TOZO NC9.
These two get lumped together as "TWS headphones," but they're built for opposite jobs. One is a sleep tool that happens to play audio. The other is a full-featured everyday listening system. Read the specs and the split becomes obvious.
• Xmenha's biggest strength: an ultra-thin, ultra-light in-ear body — around 0.07 oz per earbud — designed so side sleepers aren't jammed by a hard shell against the pillow.
• Xmenha's biggest trade-off: real-world listening time is short. The buds run roughly 3–4 hours per charge, so the 72-hour figure only exists because the case recharges them about eight times.
• TOZO NC9's biggest strength: hybrid active noise cancelling rated to a 45dB reduction depth, plus 6-mic ENC calling, a transparency mode and 32 EQ presets through the app.
• TOZO NC9's biggest trade-off: it's a normal-sized earbud in a normal case. Nothing about it is shaped for sleeping on your side, and the ANC/battery headline numbers depend on which mode you're in.
• Pick Xmenha if your priority is comfort in bed, on a plane, or during a nap — and audio quality is secondary.
• Pick TOZO NC9 if you want one pair for commuting, calls, travel and music, and you don't plan to sleep in them.
The Xmenha Flat Invisible Sleep is a single-purpose product, and it's honest about that. The body is deliberately mini and thin, with an L-shaped rubber ear cap that's meant to sit flush enough that lying on your side doesn't press a plastic shell into your ear. At roughly 0.07 oz per earbud, it's about as close to "nothing there" as an in-ear design gets. If you've ever given up on sleep earbuds because they hurt after twenty minutes on your side, that's the problem this product exists to solve.
Buy it if you're a side sleeper, a napper, or someone who wants a discreet bud for podcasts and white noise at night. Skip it if you need all-day battery from the buds themselves, active noise cancelling for a loud commute, or app-level sound tuning. It's also worth checking the current price on Amazon, because at this feature level the value question is entirely about what you're paying for the sleep-specific shape.
TOZO NC9: Who It's For
The TOZO NC9 is the opposite philosophy: pack in as much capability as the shell allows. The headline is hybrid active noise cancelling with a stated maximum reduction depth of 45dB, plus a transparency mode so you can hear announcements or traffic without pulling a bud out. Six microphones with ENC handle calls, filtering background noise so your voice comes through in busy places — the kind of thing that matters on a train platform or a shared office.
Sound is handled by 10mm dynamic drivers with TOZO's OrigX Acoustic 2.0 tuning, and you can reshape it with 32 EQ options in the TOZO app, including bass level and noise-control modes. Latency is listed at 60 milliseconds, which is low enough for video and casual gaming to stay in sync. Battery is the other big number: 14 hours per bud and 60 hours total with ANC off, dropping to 10 and 40 hours with ANC on, after a 1.5-hour charge. The case has an LED display for remaining battery. Bluetooth 5.3 with a 20-meter range, IPX8 water protection, and six sizes of ear tips round it out.
Buy it if you want one pair of TWS headphones for commuting, calls, travel and everyday listening, and you like the idea of tuning the sound yourself. Skip it if sleeping in earbuds is your main use — the ergonomics and case size are built for daytime wear, not pillow pressure. Again, check the current price on Amazon rather than assuming; the feature list is long, and that's the whole point.
• Best for side sleeping → Xmenha Flat Invisible Sleep. The thin body and 0.07 oz weight per bud are the entire design brief.
• Best for noise cancelling → TOZO NC9. Hybrid ANC with a 45dB maximum reduction depth versus passive sound isolation.
• Best for calls → TOZO NC9. Six microphones with ENC beat a voice-focused noise-control setup on paper.
• Best for long sessions away from a charger → TOZO NC9. Up to 14 hours per bud and 60 hours total with ANC off, against roughly 3.5 hours per Xmenha charge.
• Best for a discreet, barely-there fit → Xmenha Flat Invisible Sleep. Nothing in the NC9's spec sheet is aimed at invisibility.
• Best for customization → TOZO NC9. 32 EQ options and app control versus none listed for Xmenha.
• Best for sweaty or wet conditions → TOZO NC9. IPX8 versus IPX5 — both handle sweat, but the NC9's rating is the deeper one.
• Best for simple, no-app listening → Xmenha Flat Invisible Sleep. Bluetooth 5.2, voice control, nothing to configure.
• Best for travel where you'll also want to hear announcements → TOZO NC9. Transparency mode is the deciding feature.
In my opinion, the TOZO NC9 is the better buy for most people, because it's a genuine all-rounder: active noise cancelling, strong call hardware, a long battery, app tuning and IPX8 protection cover work, travel and daily listening in one pair. I'd only steer you to the Xmenha Flat Invisible Sleep if sleeping in earbuds is the actual reason you're shopping — and for that one job, its thin, featherweight shape makes far more sense than any standard TWS bud. Buy for the job you have, not the spec sheet you admire.
how to connect tws headphones
Open your phone's Bluetooth settings, put the earbuds in pairing mode (usually by taking them out of the case for the first time), then select the earbud name from the list. The Xmenha uses Bluetooth 5.2 and the TOZO NC9 uses Bluetooth 5.3, so both work with any modern phone.
how to pair tws headphones
Pairing is the same first-time step as connecting: get both buds out of the case, wait for the indicator to signal pairing mode, then pick them in your device's Bluetooth menu. After that first pairing, both of these reconnect automatically when you take them out near a previously paired device.
how to use tws headphones
Charge the case first, take the buds out, connect over Bluetooth, then control playback with the onboard controls. The Xmenha relies on voice control and sound isolation, while the TOZO NC9 uses touch controls plus the TOZO app for EQ, noise-cancelling modes and firmware updates.
how to reset tws headphones
Most TWS buds reset by placing them in the case and holding the touch area or a case button until the light flashes, which clears the paired-device memory. The exact gesture differs between the Xmenha and the TOZO NC9, so follow the reset steps in each product's own manual rather than guessing.
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