TOZO NC9: problems, parts and running costs
Checked: 2026-10-05
Summary
The recurring problems are wireless charging that some current units do not support despite the product page listing it, plus audible ANC hiss, weak microphones and inconsistent touch controls measured on the earlier NC9 generation. There is no published price for the NC9 in the sources used here, so no reliable yearly running cost can be given. It makes sense as a cheap ANC pair for commuting or the gym, not as a neutral-sounding headset or a calling device.
Common problems and fixes
- Wireless charging not working — a 2026 owner thread reports two separate newly purchased NC9 units that would not charge wirelessly even though the current product page lists wireless charging; test it in the return window, and treat the feature as uncertain. [1] [3]
- ANC hiss — independent testing of the earlier NC9 found audible hiss while noise cancelling was on; there is no fix, but transparency mode avoids it. [2]
- Weak microphones in noise — the tested unit had poor microphone noise handling, so calls from a street or train are unreliable; use it for listening and keep a phone or a second headset for calls. [2]
- Inconsistent touch controls — taps were missed or misread on the tested unit; change modes through the app when the touch surface misbehaves. [2]
- Shorter battery with ANC on — the tested unit measured 6 hours 38 minutes of ANC-on playback against a then-claimed 10 hours; the current 18-hour claim is a different generation and untested, so plan short sessions when using ANC continuously. [1] [2]
- Large housings and average comfort — independent testing called the shells big and comfort average; the current revision ships six ear-tip sizes to help fit. [1] [2]
- Bass- and treble-heavy tuning — the tested tuning was far from neutral, with no normal listening mode on that older unit; app EQ is the only adjustment. [2]
- Revision drift — the NC9 name covers at least two generations with different Bluetooth, battery and charging claims; confirm the Bluetooth version and battery figures on the exact listing before buying. [1] [2]
Parts and consumables
- No priced parts or consumables reported. The earbuds and their batteries are not documented as user-serviceable, so a failed battery means replacing the pair. The only optional item the sources name is replacement ear tips, with no part number or price. [1] [5]
Yearly running cost
Not enough data. There are no routine consumables except optional replacement ear tips, and no price for them appears in the sources. Sealed battery degradation, not a consumable, decides how long the earbuds last, and no replacement battery is offered. [1] [5]
When it is a good buy
The sources used here carry no store price for the NC9, so no defensible price threshold can be set. On function it is worth considering as a low-cost ANC pair for commute or gym use if the fit is secure, and it is the wrong pick if you want neutral sound, clean calls in noise, or guaranteed wireless charging. Verify the revision and test charging before the return window closes. [2] [3]
- A newer NC9 generation — the better choice when the listing states Bluetooth 5.3 and the longer 18-hour/72-hour battery claim, since the independently tested flaws belong to the older basic revision. [1] [2]
- A non-ANC or neutral-tuned pair — the better choice when sound quality and calls matter more than active noise cancelling, which the sources describe the NC9 as compromising on. [2]