M175 Mobile Headset offers hands-free convenience everywhere you go. Its convertible design can be worn with a headband or an earloop (both included) for acoustic listening, or use the earloop with an in the ear hearing aid for a clean clear induction signal. One touch volume and mute controls. Approximately 20dB amplification. The noise cancelling microphone keeps your voice crystal clear in noisy environments, plus there is a microphone volume switch for extra boost to your voice. Comfortable, durable and lightweight, it also works with headset ready cordless and corded phones with 2.5mm jacks. One year warranty.