The Blue Light Up Micro USB Charge and Sync Cable is made of electroluminescence (EL), and is an optical & electrical phenomenon that emits light with the passage of an electric current. The light pattern lights up fast when the device has a low battery and slows down as it nears a full charge. Avoid tangling wires with this flat cable design. Easy to wrap up and store away. Quickly charge your mobile device while syncing data at the same time. Measures 2.9 feet (34.8"). Comes packaged in a clear hanging bag.