Nokia Steel HR is the first activity tracker with heart rate monitoring to offer a long-lasting battery life of 25 days, all housed in a classic watch style perfect for transitioning from the gym to the office to a night out. Plus stay connected with smartphone notifications that appear right on the watch screen. Up to 25 day battery life. Water resistant to 50 meters. Size: medium. Tracks steps, distance, calories, heart rate and sleep. Call notifications with caller ID, text notifications, calendar alerts. Compatible with iPhone, iPad, or iPod touch with iOS 8 or later, or smartphone/tablet with android 6 or later (android 4.3 or later without phone notifi cations). Connects via Bluetooth. Water resistant up to 50m. 600 hours battery life from a 2 hour charge. 3.6cm LED screen. Size H1.3, W1.8, . Manufacturer's 2 year guarantee.