Screen size: 1.69" TFT LCD Strap material: TPU Adjustable length: 16.5-24 cm (adjustable and replaceable) Charging time: 1.5 hours Using time: 5-7 days Standby time: 15 days Waterproof: IP67 Application: GloryFit System requirements: Android 5.0, iOS 9.0 or higher. This smart activity tracker will track your sleep activity, recording your deep sleep, light sleep and awake duration and wakes you up with silent vibrating alarms.A comprehensive sleep quality analysis in GloryFit App also helps you adjust yourself for a healthier lifestyle. Allows you to control music via the fitness watch, making you enjoy the world of music freely. Connect your mobile phone to this smartwatch via Bluetooth, play and pause music or switch songs by control watch, without having to remove your phone from your pocket. This smartwatch is made with IP67 waterproof standards allowing you to wear it when you are washing hands, running in the rain and it can be worn while swimming. (Note: Not suitable for diving, swimming in the sea, or sauna.) Brightness Adjustable 4 levels of brightness for you to choose from. Brightness options allow you to easily read information in the sun or dark. Right brightness make you easy to operate and easily check detailed data reports. Adopted advanced heart rate sensor, It can monitor your heart rate automatically every 5 minutes all day.You can manually track your real-time heart rate on the watch; you can also intuitively check the heart rate in the GloryFit app.This watch can also track your blood pressure and blood oxygen in a very convenient way.（Not for medical purposes） The upgraded charging stand makes charging more stable and faster. A single charge (1.5 hours) can enjoy up to 5-7 days of battery life or up to 15 days of standby time. You will always have enough power to "go all out." (Note: Please do not let your smart watch come into contact with hot water). When you connect the sports watch to the phone, you can use remote photography. When you activate the camera function in the app, you can take beautiful photos by shaking the fitness watch screen. With the remote photography function of smart watch instead of selfie stick, record all the memories of family and friends all the time. Check future weather conditions at any time. After connecting the pedometer watch and the phone, turn on the GPS function of the phone to check the local weather. You can also switch between Celsius and Fahrenheit temperature units according to your habits to make your life more convenient. Whenever you receive a notification, SMS, calls or messages from APP (Facebook, WhatsAPP, Messenger, Instagram, Gmail and etc.) from the smartphone, the smart watch vibrates slightly and allows you to view the information on the display and the name of the sender.