Logitech Mobile Express Bluetooth Headset Talk for up to 4 hours! Also enjoy 250 hours of stand-by time Put it in your pocket. Its super lightweight at 1/2 oz Use it with either ear - The adjustable-fit ear loop fits either ear comfortably and securely on either ear. Enjoy advanced calling features - It supports call end/answer/reject, voice dialing, last number redial, and mute functions Adjust your volume or mute your call easily, with the Volume Up/Down button