Sound ID 510 Bluetooth Headset The worlds first Bluetooth headset with its own iPhone App Allows the Sound ID 510 headset to be activly paired with two Bluetooth enabled mobile phones Charge or upgrade your headset anywhere with USB connection to a computer. Wall adapter also included. Listen to music, GPS navigation, webcasts and more on your headset (firmware update may be required) Advanced Lithium-Polymer battery provides up to 5 hours talk time, lasting 135 hours on standby.