1.3-inch display and app compatibility: 1.4-inch full-screen display with 5 levels of adjustable brightness. The app requires Android OS 5.0 or iOS 9. 0 and higher or Bluetooth 4. 0 and higher, only suitable for smartphones.Smart Health Monitoring: The Fitness Tracker can automatically monitor your heart rate and blood pressure for 24 hours to better understand your health. Automatically monitor your sleep, differentiate between deep sleep and light sleep, and create a sleep state diagram so you can better assess the quality of sleep.10-day battery and quick charge: The Honor Band 6 activity tracker can last for 10 days. Honor Smartband charges quickly: just 10 minutes can be used for 3 days.Smart notifications: When your fitness watch is paired with the Veryfitpro app (free download), you can send SMS notifications from all your favorite social media platforms like Facebook, Twitter, WhatsApp, Instagram and others right to your wrist. You can even decline incoming calls right from your wrist. This is ideal when you cant answer a call.Stay in touch all day: After bluetooth connected to smartphone, this smartwatch supports incoming calls, SMS reminders and various message notifications from social apps like Facebook, WhatsApp etc. (only reminder, no reading, calling and writing functions )