Keep Smart Fitness Tracker B4 Black - Blood Oxygen Monitoring, Activity Tracking for Men and Women

Power Supply: Magnetic charging Blood Oxygen Monitoring: Real-time monitoring Display: Color Screen Type: OLED Activity Recognition: Indoor running, Outdoor running, Indoor walking, Outdoor walking Water Resistance: 50 meters AI Voice Function: Not supported NFC Function: No NFC Blood Pressure Monitoring: Not supported Heart Rate Monitoring: Real-time monitoring Satellite Positioning: Other Strap Material: Silicone Device Model: Other Payment Function: Scan-to-pay