iStyle Free Wireless Flex Activity Tracker Fitness Health Tracker Bluetooth Wristband (Hot Pink) Monitor how long and how well you sleep. Tracks steps, distance, calories burned and stairs climbed. Wakes you (and not your partner) with a silent alarm. Syncs automatically to your computer or select smartphones and tablets via Bluetooth 4.0 Slim, comfortable and easy to wear.IP65 protection grade, easy to wear with water-resistant, wear it all day and night even if swimming, rainning, or wash your hands.