Fitbit showed at CES 2013 its new bracelet called Flex. According to the authors, it is the first bracelet to monitor physical activity and sleep, working on Bluetooth 4.0, which means that it will last very long. Application to work with this bracelet is available for iOS and Android, and it will show you the number of steps, distance, calories burned and so on and so forth. The device also goes to sleep, while sleeping host, which will save the battery. Cost Flex $ 99.95, pre-orders begin today, the actual sale - Spring 2013.