Special Feature Sleep Monitoring Round Shape Age range (description) Adult Smartphone compatible peripherals Digital Display Type Type of USB connectors   Battery life: 16 days ultra-long battery life 5ATM water resistance: water resistance up to 50 m Ultra-light 32g design Blood Oxygen Test: Check your blood oxygen saturation to give you a better picture of your physical health Heart rate monitor: 24-hour real-time heart rate monitoring Sleep Monitoring and Scoring: Analyze sleep quality by recording comprehensive sleep data such as deep sleep, light sleep, and sleep duration to help maintain good sleep habits. Activity tracking with 117 sports modes including running, cycling, swimming, hiking, boating, jumping, yoga, climbing, sailing, soccer, skating and much more Vital signs monitoring: analyze your vital signs to understand your physical condition and reduce the chance of exercise-related injuries when you're fatigued Stress monitoring: tracks and monitors your stress and gives you tips to relax and recover from stress GPS Support   Model BHR4723GL