Up to 20 days of battery life (If Automatic Heart Rate feature is turned on then expected battery life will be 3-9 days). Compatible with Android 4.4 or later/iOS 9.0 or later Use Mi-Fit App to connect the phone. Connectivity - Bluetooth 4.2 0.78” OLED touch screen. The adjustable strap length is 155 - 216mm
All-day activity tracking: Track steps, distance, calories burned, active minutes, you can check daily activity and time on OLED display or APP TFT HD LCD touch screen, there have four different operation interface for you to change, Resolution ratio: 128x64 pixel; 380MAH polymer lithium battery, standby time up to 2 Days fully charged You will receive only notification to See Calls & Messages on Your Wrist: Receive/Rejection call, calendar, SMS and SNS (Facebook, WhatsApp, LinkedIn, Instagram, and Twitter) notifications on display, fitness tracker band let you never miss the messages that matter.