QuieTunes 666, A high performance AM/FM Radio Earmuff. Elvex newest QuieTunes AM/FM model is our response to the markets requirement for a higher attenuation model. QuieTunes, Com-666 offers the following features: Tested to the new ANSI S12.6-2008 standard. Field attenuation in the range of 28 dB to 36 dB (NRS-Noise Reduction Statistic). The electronics have been separated from the hearing protection cavities, in order to avoid the problems associated with moisture and sweat affecting the life span of the electronics. A sensitive radio offers FM and AM reception, so that you may listen to music, your favorite sports team or talk radio show. The standard model uses two AA alkaline batteries (included) and they are replaceable through an external battery compartment. A fresh set of batteries provides about 150 hours of operation. Just in case you forget to turn off your radio headset, we have assured that you do not come back to a dead unit, by incorporating an automatic four-hour shutoff. The sound generated by the speakers is limited to a safe 82 dB level with the use of a gain limiter. Independent testing established a Noise Reduction Statistic of 28 dB to 36 dB depending on user skill level. Input jack that allows connection of auxiliary devices, such as MP3 players, CD-players and communications radios.