The world’s first smart wristband that can detect Pulse Transit Time, providing the wearer with real-time measurements simply by placing a finger on the sensor. Specification Watch Band: Silicone (medical grade) Quick release watch band: No Water resistance: 5ATM (50 meters) Battery life: 4-7 days Charging time: 1-2 hrs Health Management Real-time PTT index (similar with blood pressure) tracking: Yes Background PTT index (similar with blood pressure) tracking: No ECG for Heart rate reminder: Yes Skin temperature: No Real-time SPO2: Yes Background SpO2: Yes Background/resting heart rate: Yes Activity & Exercise Tracking All-day activity tracking: Yes Workout Summary: Yes Multi-Exercise mode (biking, jogging): Yes Indicator for aerobic exercise: Yes Exercising coaching (on-screen workouts): Yes Reminder to move: Yes Altimeter: No Built-in gyroscope: No Built-in GPS for tracking: Yes Sleep Tracking Auto sleep tracking: Yes Total sleep times / Average heart rate & SpO2: Yes Snoring tracking: Yes Sleep stages: Yes Comfort sleep and sleep score: Yes (by HRV & heart rate) Stress Management Body Energy - Vitality & Relax Index (to show the sympathetic & parasympathetic status): Yes De-stress index (from HRV, real-time & background): Yes Others Music Control: Yes Mobile Payment: No Smartphone notifications: Yes Remote picture taking: Yes Quick reply: No 3rd Party SW Support: Google Fit / Health Kit / Strava / Other Medical Devices