FSL Reflex Bluetooth Sports Earbuds - Twin Battery for Double Battery Life Most Bluetooth earphones only have one battery meaning you have to constantly keep recharging them. The FSL Reflex has two batteries giving up to 12 hours usage. Over the ear pro fit, the earhook fit is perfect for running as the cable goes on top of the ear. Features built-in microphone for phone calls and remote for volume control and track selection. Compatible with iPhone 4, 5, 6, iPods, Samsung Galaxy Note and most Android smart phones, as well as Bluetooth enabled tablets IPX-3 rated water resistance makes these Bluetooth earbuds sweat and rain-proof Package contains hard zip-up case and 4 different sizes of interchangeable rubber eartips Includes 3 year warranty and FSL Lifetime Support from its dedicated Futuresoundlab website