Capacity 4 GB water resistant (salt water) up to 2 m deep works at temperatures between -5 ° C and 45 ° C All-in-one design for wireless workouts fast charge, 12 hours of battery connectivity: USB connection: High-speed USB (USB 2.0 compatible) System requirements: Mac OS X (10.6 or later), Microsoft Windows 8, Windows Vista (SP2 or later), Windows 7 (SP1 or later), Windows XP ( SP3 or later)