The Lightspeed Sierra redefines performance and value in an ANR headset, with several advanced features found in much more expensive ANR's. Sierra has integrated cell phone BlueTooth interface, plus wired interface to any portable music device â€“ and the music will automatically mute for incoming transmissions. Sierra will operate for up to 40 hours on two "AA" batteries, and the battery status indicator will let you know when the batteries are getting low. The auto shut-off feature keeps the batteries from discharge if you forget to turn the ANR off. Sierra has dual volume control, weighs 16 ounces, and includes padded headset bag, microphone wind screen, music interface cable, and Lightspeed 5 year warranty.