Market Size and What People Wear
A smart wearable is worn on the body and collects data, computes, and communicates. The usual forms are a smartwatch, a band, TWS earbuds, smart glasses, and a smart ring. The jobs are health (heart rate, blood oxygen, sleep, exercise), notifications, mobile payment, and a call that does not need a phone nearby (eSIM or LTE). The product sits between consumer electronics and healthcare.
The link shows up in three places. The device talks to a phone or the cloud over BLE or cellular (LTE/5G), so data syncs and a setting can be changed from afar. A watch with an eSIM communicates without the phone. Health readings go to the cloud, stay there, and are read by an AI model that the health service is built on.
Research puts China's smart-wearable market in 2024 above 105.1 billion yuan, up about 12%, with shipments of about 160 million units. Watches are about 40 billion yuan of that, and bands about 24 billion. Wrist-worn shipments in 2025 are expected at 73.9 million units, up 20.8%: 50.61 million watches (+17.2%) and 23.29 million bands (+29.4%). Huawei, Xiaomi, and Apple hold most of the share. Health and sport are what the products are sold on.
The 14th Five-Year Plan for National Health Informatization encourages wearable health monitors. The general specification for wearable devices covers safety, privacy, and battery life. A device that claims an ECG or blood-pressure reading has to follow the Medical Device Classification Catalogue. MIIT's wearable data-format specification sets the format and the protocol for heart rate, blood oxygen, and sleep. An eSIM has to follow the IoT eSIM technical specification and the operator's provisioning process.
The chain runs from chips and modules (Qualcomm, MediaTek, and Nordic) through ODM and OEM makers (Huami and Goertek) to the brands (Huawei, Xiaomi, and Apple) and then to the channel (e-commerce, operators, and health services). eSIM and IoT SIM cards come from operators or mobile virtual network operators. Module makers supply LTE Cat.1, Cat.4, and NB-IoT.
Core Pain Points
Battery against features: The device is small and the cell is small. Heart rate, blood oxygen, GPS, and a cellular link all draw power. The design problem is how many functions fit into a battery that still lasts. BLE, LTE Cat.M, and NB-IoT are the low-power options that make the trade possible. A health number that has to be right, and lawful: Buyers expect the reading to be accurate. An optical heart-rate or blood-oxygen sensor moves with how the band sits, skin tone, and whether the person is moving. A claim of medical-grade monitoring needs a medical-device registration. Collection, storage, and transmission have to follow the Personal Information Protection Law and the Data Security Law. A watch that works without the phone: A child's watch and a sports watch need a call, a location, and an emergency alert on their own. An eSIM removes the card slot and can be provisioned remotely. In China the operators' eSIM service is aimed mainly at wearables, and the sign-up path and the tariff still have room to improve.
Where IoT Is Used
Health data: The device syncs heart rate, steps, sleep, and blood oxygen to the phone over BLE, and the phone sends them to the cloud. The cloud keeps the trend, warns on an abnormal reading, and returns a report and a suggestion. Some higher-end products upload over cellular, so the backup does not need the phone.
A call and an SOS: A watch with an eSIM places a call and sends a message on its own. That is the setup for a child who might wander, an older person being watched, and someone outdoors. One-press SOS sends location and the alert to a preset contact. The link is what has to hold at that moment.
A route outdoors: GPS and BeiDou plus the cellular network record the track, share a live location, and alarm on a geofence. A marathon, a ride, or a climb wants accuracy and battery together. GPS, BeiDou, and GLONASS, with a low-power mode, is the usual combination.
Standards and Terms
A typical watch draws about 0.5–1 mA on BLE standby, 2–5 mA on cellular standby, and 80–150 mA in a GPS-plus-cellular workout. The cell is 200–600 mAh, and life runs from 1 to 14 days. An eSIM can share one number across two devices or carry its own number. China's three operators all support wearable eSIM; provisioning is in the operator's app or at a store. Heart rate is usually reported every 1–5 minutes, sleep is closed once a day, and exercise goes up live or in segments. The link is encrypted at TLS 1.2 or above.
- BLE (Bluetooth Low Energy): the usual link between the wearable and the phone.
- eSIM (embedded SIM): a SIM in the device, provisioned remotely, with no card to insert.
- PPG (photoplethysmography): the optical method used for heart rate and blood oxygen.
- ECG (electrocardiogram): a single-lead ECG on some higher-end watches.
- SpO2: blood-oxygen saturation, read by an optical sensor.
Where It Has Been Used
One children's-watch brand ships more than 5 million units a year. The eSIM handles the call, the location, and SOS without a phone. A parent sees location and the track in an app, and an entry into a marked danger zone raises an alarm on its own. A sports watch used at a marathon sends location and heart rate over 4G as the race runs, for the broadcast and for medical dispatch.
Where the Market Is Heading
More readings are being added without a needle: blood pressure, blood glucose, and temperature. Large models are being used to explain a reading and to suggest what to do. More products are taking Class II medical-device registration and moving into chronic-disease management. Rings and glasses are the newer forms.
Summary
A wearable is where consumer electronics and healthcare meet. BLE, cellular, and eSIM are what sync the data, place the call, and reach the cloud. Battery life, accuracy, and compliance are what the trade keeps working on.
SimtoLink supplies eSIM, IoT SIM cards, and communication modules for these devices, on more than one operator and more than one radio, so a brand can keep a watch online and ship it beyond one country.