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How to use1.Open battery door, install the battery perfectly and push battery door into battery box gently. Put the earpiece into ear canal by holding the handle and the slight sound of current indicate working order.2.Adjust the volume of drive equipment to reach satisfaction.3.Set mobile phone to automatic return or vibration.4.Put the inductive loop around your neck and connect the inductive loop to the drive equipments (mobile phone, radio) which are attached to or beneath users clothing.