iStyle Free Flex Wireless Activity Wristband Health Fitness Sleep & Stress Tracker - Bluetooth Enabled Monitor how long and how well you sleep. 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. Syncs automatically to your computer or select smartphones and tablets via Bluetooth 4.0 Wakes you (and not your partner) with a silent alarm. Tracks steps, distance, calories burned and stairs climbed.