Make fitness a lifestyle with Flex. Stay focussed on your goals and get motivated to be more active with Flex- a slim stylish device that tracks all day activity and automatically tracks your sleep. Use the Fitbit app to set goals, earn badges, log food and connect with friends. Wear Flex your way by styling with bright accessory bands. Tracks steps, distance, calories burned, and active minutes. Style + Accessories- style the slim, removable tracker with Flex accessories. Log food, track activity, stay motivated and more via Fitbit website or the fitbit app availabile on more than 200 mobiles phones across iOS, Android and Windows. Automatically monitors how long and how well you sleep. Compete in challenges- invite friends and family to share stats, send cheers and taunts & compete on the leaderboard. Wrist monitor. Size H20.3, W6, D6cm. Weight 0.15kg. Batteries required 1 x rechargeable (included).