Click here to get your Helmet Audio Coupon Code About Helmet Audio: Welcome to HelmetAudio.com! Here you will find electronics that are tailored toward motorcycle and ATV enthusiasts. We have recently uploaded this new website. If you encounter any problems, please contact us. These helmet speakers are thin, comfortable, and provide high volume. They are ideal for motorcycle helmet use, but can be used with any helmet that covers your ears. Installation takes less than a minute and they plug into any radio, MP3, or CD player that has a standard 1/8" jack. Unlike model TM15, the TM25 throat microphone picks up vibrations from both sides of your throat and is adjustable for necks sizes of about 12-15 inches.