Get fit with Misfit Flash, a sleek, sporty fitness tracker that measures your activity and sleep, syncs with your smartphone, and comes in a variety of colors. Press Flash to see a halo of lights that shows your progress toward your daily activity goal and tells time. Flash never requires charging and is made of rugged, yet ultra-comfortable soft touch materials.We strongly recommend customers to use two battery brands which are Panasonic and Energizer.If the product is defective submit a request at help@misfit.com.For more information on how to replace a battery please visit http://misfit.com/go/flash. Please follow the below steps to sync the app: Reboot the phone, Turn OFF then turn ON Bluetooth from the phone's Settings menu and Right before syncing, try press the Flash to turn the light on. It should make syncing much easier.

Sporty design; comes in a variety of colors; ultra comfortable and waterproof to 30 meters. Never requires charging; replaceable battery lasts up to 6 months.

Measures daily activity and sleep, and syncs with your smartphone to show steps, distance traveled, and calories burned

Halo of 12 LED lights show you how active you've been throughout the day; press the button on the face of Flash to see your progress towards your daily activity goal

Tracks walking, running, swimming, cycling, soccer, tennis, basketball and more.

Kindly Find the User Manual under Product Details.