Wearables and connected devices
A watch that measures pulse accurately and one that invents it are built with the same casing. The difference lies in the sensor and in the algorithm, and neither of the two is visible in a photograph.
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What risks are there when importing wearables and health devices from China?
Wearables are manufactured mostly in Shenzhen, but the category carries two risks that do not appear in the others. The first is the real accuracy of the sensors: many devices with a low-cost optical sensor estimate pulse with an error that the user notices within the first week. The second, and more serious, is regulatory: advertising a product as a medical device —blood pressure measurement, blood oxygen for diagnostic purposes, arrhythmia detection— triggers health regulation and can turn a consumer product into a medical device that requires registration prior to sale.
Category data
- Typical MOQ
- 500 – 1.000 units
- Production lead time
- 25 – 45 days
- Pulse sensor
- Optical (PPG). Accuracy depends on the algorithm, not only on the sensor
- Documents
- UN38.3 and MSDS for the battery; Bluetooth SIG if it has Bluetooth
- Regulatory risk
- Medical claims change the product category
- Critical verification
- Compare the measurement against a reference device
The difference between measuring and estimating
A low-cost optical sensor can give a reasonable pulse reading at rest and drift noticeably when moving, which is exactly when the user looks at it. Quality is not only in the component: it is in the algorithm that filters the signal and in the factory calibration.
Many Shenzhen manufacturers have good, inexpensive modules, and the error is the importer's for not testing them. Verification is done by comparing the batch's measurement against a reference device, with the subject at rest and in motion. It is a simple test, and it is the only way to know whether the product works.
The regulatory risk that sinks products
The moment you describe your product as able to measure blood pressure, detect arrhythmias or diagnose something, it stops being a consumer accessory and becomes a medical device. That means prior health registration, quality requirements, and legal liability if the device gives a wrong reading.
The market is full of watches that claim to measure blood pressure and do not do so in a clinically valid way. Selling them with that claim in Mexico or Brazil is a serious problem, not a theoretical risk. Our recommendation in this category is consistent: describe wellness functions —activity tracking, indicative heart rate estimation— and leave out diagnostic claims. If your product really needs to be a medical device, there is a path, and it is longer and more expensive.
Battery life, connectivity and the app
In wearables, the stated battery life and the real one differ widely because it depends on screen brightness, measurement frequency and whether the app keeps a constant connection. A product that claims fourteen days may last five with normal use. Measure it, do not believe it.
The app is the other weak point. Many Shenzhen products depend on a third-party app that can disappear or stop being updated, leaving the user with a device that no longer connects. Before committing to an order, it is worth knowing who develops the application, whether it has its own store, and whether the manufacturer can hand the application over for you to publish under your brand.
Certifications and applicable regulation
Every product category has its own regime. This table summarises what each standard requires and what it is for; which one applies to your specific product depends on its classification, and we confirm that before production.
| Standard | What it covers and why it matters |
|---|---|
| Bluetooth SIG | Mandatory for any wearable with wireless connectivity. |
| UN38.3 / MSDS | For the integrated lithium battery. |
| FCC / CE | Electromagnetic emission from the radio module. |
| IEC 62368-1 | Safety of portable electronic equipment. |
| Health regulation | Applies if the product is marketed with diagnostic or medical claims. |
| ANATEL (Brazil) | Mandatory homologation of the radio transmitter. |
Frequently asked questions
Can I sell a watch that measures blood pressure?
A watch that measures blood pressure for diagnostic purposes is a medical device and requires prior health registration in most markets. Low-cost watches that claim that function usually have no clinical validation, and marketing them with that claim is a serious regulatory risk. Our recommendation is to sell clearly described wellness functions and not to make diagnostic claims.
How do I verify the accuracy of a pulse sensor?
By comparing. Take a sample from the batch and check its reading against a validated reference device, with the subject at rest and in motion. Record the deviations under both conditions. A device that is accurate at rest and drifts a lot when moving will give a poor experience, because it is precisely while moving that the user checks the measurement.
Who develops the watch's app?
It depends on the manufacturer, and it is a question you have to ask before buying. Many use their own app; others depend on a third-party app shared by several manufacturers. If the app belongs to a third party, your product is exposed to that app no longer being maintained. Ask whether you can publish your own version under your brand and who takes on maintenance.
Do I need certification for a watch with Bluetooth?
Yes. In addition to the Bluetooth SIG declaration, the radio module must comply with the electromagnetic emission regulations of the destination country, and in Brazil it specifically requires ANATEL homologation. In Mexico, equipment with a radio transmitter is subject to specific procedures before the corresponding authority. We check the applicable scope before producing.
Other categories we source
Audio: earbuds and speakers
TWS earbuds, headphones, portable speakers. The category where wireless certification gets forgotten most.
Phone accessories and 3C
Cases, screen protectors, cables, chargers and mounts. Shenzhen's deepest catalogue.
Batteries, chargers and power banks
The category where logistics outweigh price. Without UN38.3, the cargo does not ship.
Components, modules and PCBA
Industrial purchasing and board assembly. A different buyer, a different process, a different conversation.
Commission this sourcing
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