This tracker requires iOS 7.1 & Android 4.4 above, Bluetooth 4.0 (Smartphone only, not for PC, compatible with iPad, or Tablet) Note: IP67 water-resistant, you can wear the tracker when running in rains and washing hands, but do not wear it when showering, swimming, or diving. Highlight Features: 0.96 Inch OLED Touchscreen. Smart Notification: Receive and displays notifications from other apps (Facebook, WhatsApp, LinkedIn, Instagram, and Twitter) on your tracker screen. Call Alert: Tracker will vibrate and the call will be displayed on the screen when there is an incoming call. Sedentary Alert: Set reminders for periods of time of inactivity. Alarm Alert: Set silent alarms on the tracker to wake you up and not disturb your partner. Wrist Sense: The screen is automatically lightened up when you turn your wrist towards you. Bluetooth Version: Bluetooth 4.0 or later Bluetooth Transmission Distance: 10 Meters (32.8 feet) Screen size: 0.96 inch Screen type: OLED Material: Upper casing: PC, Strap: TPU