Operating System android Special Feature Multisport Tracker Battery Capacity 290 Connectivity Technology Bluetooth Wireless Communication Standard Bluetooth About this item 39.1mm (1.52 inch) Big Display- Get a clear and vibrant visual experience with the 39.1mm TFT full-touch display. With a 240*240 pixels resolution, every detail is sharp, making navigation smooth and intuitive. Wirefree BT Calling- Stay connected effortlessly with Bluetooth calling. Dial calls directly, access Siri for voice-activated dialing, and keep track of your call history, all from your wrist. Stainless Steel Design & 4 Buttons- Crafted for durability and style, the stainless steel design offers a sleek, premium look. The four buttons provide easy access to essential features, enhancing user experience. Complete Health Suite- Monitor your heart rate, track your sleep, and get reminders to stay active and hydrated. Keep an eye on your body temperature and oxygen levels, with weekly health insights to keep you informed. (This is not a medical device). Smart Features- Enjoy a range of smart features designed for convenience. Easily switch dials, locate your phone, set reminders, and capture moments with a shake. Activate the Do Not Disturb mode to stay focused when needed.