Keep track of your fitness and sleep with the Fitbit Flex Wireless Activity and Sleep Tracker. This unisex activity tracker is perfect for gym and training, walking, running, swimming, yoga, Pilates, and fitness. It has a wireless feature and can be used with iOS and Android operating systems. The device comes in a small size with a mixed color and is made of plastic material. It has a battery life that can last up to 3 days and provides measurements for calories and distance. Additionally, it has a sleep tracker feature and sensors for an accelerometer. The package includes a mobile app and supports languages such as English, Italian, French, German, and Spanish.