This smartwatch is made of diamond shaped lattice texture.The thermoplastic polyurethane material has a skin-friendly texture and is soft and smooth.Single-breasted design let you relax.All five colors are optional and can be replaced.Built-in optical heart rate sensor, pay attention to your heart rate changes 24 hours a day, record your heart rate changes every time on the excellent living app, describe your heart rate, showcase your health and beauty.The APP connection product distinguishes between exercise warm-up, fat burning, cardiopulmonary improvement and others by plotting the data obtained by monitoring.Inform you of changes in heart rate with each period of time, reasonably plan the intensity of the exercise, and unleash your sports passion more effectively.Use 1.3 inch bigger screen, bigger words, clearer touch and high sensitivity, the screen can realize various operations:smart call reminderbluetooth camerasteps, caloriesbluetooth music sleep monitoringfrequency hearThis smartwatch can quickly visualizes various functions, and the touch operation of the large color screen is smoother.Waterproof / Water Resistant: Yes Operation Mode: Touch Button Compatible operating system: Android, IOS Battery capacity: 150mAh Standby time: 5 days Functions: alarm clock, blood oxygen, Date, heart rate measurement, Message, sedentary reminder, sleep management, time Notification type: Facebook, Twitter, Wechat, WhatsApp Alert type: Vibration APPLICATION: Fitpro Dial shape: square shape Band size: 260x20mm Dial size: 39.8x39.8x9.6mm Wearable length: 160mm-240mmBefore use, scan the QR code in the manual to download the app and connect it to the watch using the app.Package contains : 1 x Smart Watch 1 x User Manual 1 x Box