Characteristics Blood oxygen sensor: Yes Heart rate monitor: Yes Active minutes: Yes Calories burned: Yes Accelerometer: Yes Sleep quality: Yes Altimeter: Yes Design Market positioning: Smartwatch Housing material: Stainless steel Watch case color: Stainless steel Watch case size: 38 mm Strap color: Black Lens material: Sapphire Shape: Round Strap material: Fluoroelastomer Water resistance: 5 ATM Power Charging time: 2 hours Supported battery type: Built-in Battery life: 30 days Weight and dimensions Product weight: 34.6 g Network Mobile network connectivity: No Efficiency Built-in camera: No Support for mobile operating systems iOS 16 Android iOS 15 FM Radio: No Package contents Quick Installation Guide: Yes User Manual: Yes Cables: USB Display Display technology: OLED Display type: Hybrid Screen diagonal: 0.63 Pixel density: 282 ppi Ports and interfaces Bluetooth Low Energy (BLE): Yes NFC: No Wi-Fi: No Headphone plug: No USB port: No Bluetooth: Yes