CNET has a review of the Cardo Scala 700 and writes - “Another cool feature of the Scala 700 is its swap technology. You can swap the headset between two phones just by pressing the control wheel twice. The wheel also acts as a volume rocker and allows you to adjust the direction of volume up or down depending on which side you prefer to wear the headset. Battery status is obtained by pressing the headset’s control button for at least 7 seconds while the Scala 700 is on. The status light will flash blue when the headset is fully charged, red and blue for half-charged, and red for a weak charge. Other features include answering, rejecting, muting, redialing, or ending calls; voice dial; call waiting; conference call support; and locking or unlocking control buttons.”

Read more about the Cardo Scala 700 Bluetooth headset