KARSEEN Fitness Tracker Smart Watch H3 Color Screen for Blood Pressure and Heart Rate Monitor Phone Enabled IP67 Waterproof Pedometer Sports Watch for Men New Design 24/4 Sensor: 3 Heart Rate Monitor Light and 1 infrared Sensor detect more accurate. Can accurately measure black man heart rate. In the heart rate monitoring interface, it would automatically enter the heart rate detection mode, supporting dynamic 24hours real-time heart rate detection. 3 Main Interfaces Color Screen: There are 3 main interfaces in the band. Long press for three seconds on the main interface to select which specific interfaces to switch to. Single click to switch. Long press and hold for three seconds to confirm selecting the current main interface. After the APP is paired for the first time, the band will synchronize the time and date of the phone. 24/7 Heart Rate BP Tracking: Everything starts with health. Automatically and effectively track your heart rate and blood pressure throughout the day and night with your the blood pressure monitoring interface.it would automatically enter the blood pressure detection mode. Reminder Function Receive call, SMS and SNS (Facebook, LinkedIn, Instagram, Twitter and other apps) notifications. Female physiological period reminder, alarm clock, heartrate warning and sedentary reminder. It brings convenience to your life. New Design with USB Charge: Just charge with any USB port (no cable needed). One full charge gives you up to 13-15 days of working time. KARSEEN promise 45 days no reason money back and 1 year warranty.