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. Approximately 20dB amplification. The noise cancelling microphone keeps your voice crystal clear in noisy environments. Comfortable, durable and lightweight, it also works with headset ready cordless and corded phones with 2.5mm jacks. One year warranty.