1.69 "Custom Dials & No Charge APP?--This fitness watch has dials that you can choose directly from veryfit APP, and also supports you to customize any picture on your phone. APP is no charge, and it will help you to assist the use of the watch. Please download and install "VeryFit" APP on your phone when you first use the watch. Battery and Compatibility?--It can be used for 5-15 days with a full charge. *Usage time varies depending on the level of use. The smartwatch is available for iOS/Android phones. Supports smartphones with IOS 9.0 or above, Android 6.0 or above. One-year warranty is offered. Please feel free to contact us if you have any problems. Fitness Tracker and other Functions?--The fitness watch has 20 exercise modes for daily workouts (walking, running, biking, swimming, etc.) The watch can display statistics such as calories, exercise duration and distance.The smart watch for men and women also has alarm clock, stopwatch, timer, deep breathing guide, music and phone camera controller, weather, find your phone, etc. Health Monitoring & 5ATM Waterproof?--It monitors your heart rate 24h/d, blood oxygen, pay attention to your health at all times, record physical changes, and let you know more about your physical condition. All of which can be operated on the watch and data can be viewed on the fitness watch or in the app. Tracks your time during light sleep, deep sleep, and awake sleep also. 5ATM waterproof function which is not limited in outdoor activities and swimming. Notification & Alexa?--See Calls & Messages on the smartwatch!(but can not reply) Receive notifications on display like, call, weather, SMS and SNS (Facebook, WhatsApp, LinkedIn, Instagram, and Twitter etc.) ; Vibrates to notify you,helping you stay be notified; reminds you to move after periods of inactivity. As for Alexa ,ask it what you want to know, such as schedules, workout results, health data, and a variety of questions. Then you will get respones.