Nokia Steel lets you run, walk, swim, or dance the night away without your phone. Theres no charging and no button to press ; Nokia Steel automatically tracks everything and syncs to the free Health Mate app to give you in-depth metrics, personal coaching and more. Up to 8 months 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 notifications). Connects via Bluetooth. Water resistant up to 50m. 600 hours battery life from a 2 hour charge. 3.6cm LED screen. Size H1.15, W1.8, . Manufacturers 2 year guarantee.