【Screenless Ultra-Thin Design】The NB2 smart bracelet features a screenless design with an ultra-thin alloy case measuring only 4.9mm in thickness for a lightweight and comfortable fit. 【Comprehensive Health Monitoring】Tracks heart rate, blood oxygen, stress, and sleep in real time, providing detailed insights into your daily health status. 【IPX8 Waterproof Protection】With an IPX8 waterproof rating, the bracelet is suitable for shallow-water activities such as swimming, rafting, and playing in water. 【Multiple Sports Modes】Built-in multiple sports modes including outdoor running, indoor running, cycling, walking, tennis, swimming, and yoga to track your exercise progress. 【Long Battery Life】Powered by a 33mAh polymer lithium battery, the bracelet delivers 7-10 days of daily use and up to 25 days of standby time. Specifications: Hardware CPU AB2056D Material Zinc alloy + epoxy resin Bluetooth-compatible Version BLE 5.3 Battery capacity 33mAh Working Time About 7-10days Charing time 2H G Sensor) SC7A20H Heart Rate Sensor HX3918H Charging Cable Magnet Cable(With SMT Protect IC) Waterproof Level IPX8 Charging Requirement Charging 1A or less Software APP Nx Wear Function Heart rate detection Blood oxygen test Pressure detection Heart rate variability Female physiological cycle Shake it to take a photo Multiple sport modes Sleep detection (Sleep time, Sleep quality) Step count Synchronous data to APK/APP APP Download Download "Nx Wear" from Android market or for Apple store Scan the following QR code and download “Nx Wear" Specification System Requirements Android: 6.0 or aboveiOS: 11.0 or higher Environmental Requirements Operating temperature: 0~45°C Storage temperature: -10~55°C Working humidity: 5%~95% (non-condensing) Electrostatic protection: electrostatic standard contact: ± 6KV, air: ± 10KV Surge protection: 12V Drop requirements: refer to GB/T 2423.8 standard Vibration requirements: refer to GB/T2423.10 standard Charging temperature protection: 45°C Product Size Device Size 42.6*20.5*3.0mm Strap Width 16mm Package included 1 x Smart Wristband 1 x Charging Cable 1 x English User Manual Specifications Brand N/A Certificate CE-RED,CE-RoHS Color Gold Packaging Type Colored Box Plug Type (For Supply) N/A User Manual (Language) English Gross Weight 0.134kg Volume Weight 0.085kg Package Length 27.000cm Package Width 7.000cm Package Height 2.000cm