Built-in speaker: provides Bluetooth calling function, lift your wrist to dial and talk, check your mobile phone contacts, and listen to your favourite songs while running, enabling hands-free music calls. The dialing function data display supports custom settings.Sleep quality detection: nighttime sleep breathing quality monitoring, by continuously monitoring health changes, analyzing breathing during sleep and providing a sleep breathing quality score for a more restful sleep, supports IP67 waterproofing.Aluminium material: 1.57" large colour screen with increased display area. Brings a wider field of view. 2.5D curved glass design brings a seamless look for a smoother touch experience.Magnetic charging: fully charged for a week's worth of business or travel without even remembering to bring a charger. Endurance and explosive power at the same time online. Indoors or out, it is equipped with several professional sensors that measure calorie burn and vary according to your exercise status.Multiple exercise modes: show your exercise time, steps, calories burned and more while in motion. Running, cycling, even playing badminton or jumping rope, you can use it to record, supporting heart rate, blood pressure and blood oxygen monitoring. Let you fall in love with healthy and efficient exercise