The Fitbit Flex wireless activity and sleep wristband will track your steps, distance, calories burned and active minutes, plus it monitors how many times you wake up at night so you can adjust your sleeping patterns for a longer, healthier sleep. The Fitbit Flex wakes you up with a silent alarm that gently vibrates. The LED lights show your progress in your workout based on your goals, plus its slim, water-resistant design is comfortable to wear on your wrist and can be worn all day and night, even in the shower. Enjoy its built-in wireless technology that can sync with your computer, smartphone or tablet to transfer your stats. Features Wakes you up with a silent alarm that gently vibrates LED lights show how you're doing based on your goals Log food, weight and more on Fitbit's website or app Tracks, steps, distance, calories burned, active minutes and sleeping patterns Slim, water-resistant design with Bluetooth® technology 3-pack in small Supports PC, Mac, iPhone 4s/5/5s, iPod touch (5th generation), iPad Air, iPad mini, Samsung Galaxy S4, Samsung Galaxy S III, Samsung Galaxy Note II or Samsung Galaxy Note 10.1 devices *Fitbit Flex sold separately. Fitbit Service Policy: 30 day refund or exchange on unopened product. After 30 days, warranty and service of your product will be handled solely by Fitbit.