Answer/Hang Up Reminder Message This smart watch supports two-way conversation. After establishing a connection with APP Dafit, you can directly call and chat with family and friends anytime, anywhere. In addition, this fitness watch can remind you of text messages, calendar events and other social media applications (Facebook, WhatsApp, Twitter, etc.) in time, so you won't miss anything important. Heart rate Sleep monitor This fitness tracker supports 24/7 automatic heart rate monitoring. You can check your heart rate changes at any time. The sleep monitoring function of the smart watch can also record your sleep status to help you understand sleep data (deep sleep,light sleep and wake time), provide you with reference numbers for daily health analysis to help you build a healthier lifestyle.