1.43" Big AMOLED ScreenCompared with other normal LCD screen in the market, Chronus sports smart watch for men uses the latest HD AMOLED screen, which is brighter and clearer than most smartwatches. The men smartwatch with metal frame is quality and textured and suitable for business occasions.Bluetooth Call & NotificationsBuilt-in speaker, Chronus tactical smart watch for men supports Bluetooth calling (make/answer call, play music). In addition, you could receive calls, messages, SNS notifications on Chronus men smartwatch with call in real time, never worry about will miss any important calls or messages.Never Miss Any ActivityChronus activity tracker for men supports real time heart rate, blood oxygen, sleep and pressure monitoring, has 100+ sports modes, which can be used as a fitness tracker watch to record your every workout data (time, steps, calories, mileage).Functions on Chronus Smart WatchTelephone, Contact Person, Call Records, Voice Assistant, Data, Workout, Workout Records, Heart Rate, Sleep, Blood Oxygen, Pressure, Messages, Weather, Female, Music, Breath Training, Stopwatch, Timer, Alarm Clock, Set Time, Find Phone, Screen Time, Raise to Wake, AOD Clock, Power Saving Mode, Vibration Intensity, Language.Compatibility & NoteChronus military smart watch for men with call function is used with FitCloudPro app, compatible with the most iPhone Samsung and other Android phones (Android 5.0; iOS 10.0; Bluetooth 5.1), has a built-in 350mAh battery, can be used up to 5 days.