Xiaomi Mi Band 7 8 Smart Bracelet AMOLED Screen Miband 8 Blood Oxygen Fitness Traker Waterproof Xiaomi Smart Band 7 8 -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Description:Product parametersProduct model: M2239B1Main net weight: approximately 27g, including wrist strapBody size: 48-22.510.99mmScreen size and type: 1.62-inch AMOLED screenScreen resolution: 192-490Screen brightness: up to 600nit, supporting automatic brightness adjustmentCover plate material: 2.5D reinforced glass cover plateShell material: PCSensors: optical heart rate and blood oxygen sensors, six axis motion sensorsWaterproof grade: 5ATMWireless connection: Bluetooth * BLE51Vibration motor: rotor motorBattery capacity: 190mAhBattery type: lithium-ion polymer batteryCharging time: Supports fast charging, with a charging time of approximately 1 hourWrist strap adjustable length: 135-210mmSystem languages: Simplified Chinese, Traditional Chinese, EnglishSupport system: Android 6.0 or iOS12.0 and aboveSupporting APP: Xiaomi Sports and HealthPackage Included:1 * Smart Watch1 * Charger1 * Instructions