The OnePlus Watch 3 43mm features a 1.32″ AMOLED touchscreen with a resolution of 466 x 466 px and a pixel density of 352 ppi, and supports always-on display for continuous visibility. The case measures 43.2 x 43.2 mm with an 11 mm thickness and a volume of 20.52864 cm³, keeping the overall weight at a light 37.8 g. It carries a 5 ATM and IP67 water resistance rating, classifying it as waterproof for everyday use. The watch band is user-replaceable, offering flexibility over time, though the display does not feature branded damage-resistant glass or sapphire glass protection.
The OnePlus Watch 3 43mm includes a solid set of onboard sensors, with a heart rate monitor and pulse oximeter covering core health tracking alongside a gyroscope and accelerometer for motion detection. A compass and built-in GPS support navigation and outdoor activity tracking. However, the watch does not include a body temperature sensor, barometer, cadence sensor, or perspiration monitor.
The OnePlus Watch 3 43mm covers a broad range of activity tracking capabilities, including steps, distance, pace, elevation, and route tracking, along with automatic activity detection and exercise tagging. Sleep tracking is also supported, with dedicated sleep reports available for deeper insight into rest patterns. Calorie intake tracking rounds out the wellness side of the feature set. The watch does not include a multi-sport mode and is not designed for diving or golf specifically.
The OnePlus Watch 3 43mm is compatible with Android devices only, with no support for iOS. It connects via Bluetooth 5.2 and includes NFC for short-range interactions, as well as Galileo satellite support for positioning. While the watch lists Wi-Fi 4 (802.11n) as a specification, the Wi-Fi toggle is not supported. It does not include a cellular module or ANT+ support.
The OnePlus Watch 3 43mm is equipped with a 354 mAh rechargeable battery rated for 2.5 days of typical use, while power save mode extends that to 168 hours. In training mode, the battery lasts up to 36 hours, and a full charge takes approximately one hour. The battery is neither removable nor solar-powered, and the watch does not support wireless charging.
The OnePlus Watch 3 43mm offers a well-rounded feature set centered on health monitoring and smart functionality. On the health side, it tracks HRV, resting heart rate, and VO2 max, delivers fast and slow heart rate notifications, and shows a readiness and recovery level, though it lacks ECG technology, irregular heart rate warnings, and fall detection. For day-to-day use, the watch handles wrist notifications, call answering and call control, voice commands, a silent alarm, vibrating alerts, a stopwatch, and a camera remote shutter function, while a smart alarm is not included. 2 GB of RAM and 32 GB of internal storage give the watch a notably generous hardware foundation, and there is no front camera or fast GPS lock capability on board.
The OnePlus Watch 3 43mm companion app supports a comprehensive set of wellness and lifestyle tracking tools, including activity reports, goal setting, and achievements to help users monitor progress over time. Inactivity alerts, calorie burn tracking, water intake tracking, and weight tracking are all included, covering both fitness and general health habits. A barcode scanner feature is not available in the app.
The OnePlus Watch 3 43mm includes a battery level indicator for at-a-glance charge monitoring. It does not offer an external memory slot, a 3.5 mm audio jack, or compatibility with Windows or Mac OS X.
