1It can automatically record the time of stable sleep, unstable sleep, and waking up, and provide more than 200 tips to improve sleep quality. 2Equipped with 24hour realtime heart rate monitoring, night infrared heart rate monitoring, heart rate warning and other functions. 3Include call notification, call rejection, SMS, email, SNS notification, smart alarm, timer and other functions to make your life simpler and smarter. 4Waterproof, not afraid of the rain, not afraid to splash water when wash your hands. 5The watch fits your wrist well and won't slip off easily, giving you a comfortable using experience.