Activity Monitors features: Smart watch for Unisex with bluetooth calls, heart rate and physical activity monitor, 1.78 '' screen for Android IOS-Silver Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. (Multifunction Bluetooth Calling Smart Watch) Answer / Make Call, UI Dial Adjustment, Multiple Operation Menu Styles, Activity Tracker, Heart Rate Monitor, Blood Pressure Measurement, Blood Oxygen Measurement , sleep monitor, automatic pedometer, alarm, stopwatch, multi-sports mode, sedentary reminder, music control, phone search, incoming call and SMS reminder, etc. Very nice gift for men, women and children. (Health Monitor and Sleep Monitor) Adopt the latest HR sensor for accurate and efficient heart rate tracking, blood pressure measurement, blood oxygen measurement. This watch will automatically detect your sleep at nightfall and analyze the quality of your sleep with deep sleep, light sleep and wake time. The silent vibrations can wake you up without disturbing others. (Bluetooth call and message notifications) Chronus smart watch with built-in speaker, microphone you can make / receive phone calls. When there are SMS or other messages (Instagram, Facebook, Twitter, WhatsApp, etc.). in your phone, the watch will vibrate and ring to remind you. So you won't miss any important calls or information. These functions will come in handy when you play sports or work hard. (IP67 waterproof fitness watch) 1.78 inch color screen and IP67 waterproof standard, making it a star and the best choice for fitness tracker. Built-in multisport mode, records your daily sports data. The app will record your phone's GPS trajectory after each exercise and trajectory, the app will display the heart rate and intensity of exercise in real time. (Great Compatibility) Chronus smart watch is suitable for most Android and iOS smartphones, download and enter “Wearpro” APP (you need to download the software by scanning the QR code on the manual or download from the market. 'application). After connecting the smart watch to the smartphone through the app.