Elvex Aware, Com-680, is a hearing protector with built-in stereo Am/Fm Radio, and Aware technology. The Aware technology allows you to listen to the environment and communicate with coworkers while listening to the radio. Com-680 provides Radio-reception on the FM-band between 88 and 108 MHz and on the AM-band between 520 and 1700 KHz, while still protecting your hearing in an efficient and comfortable way. Accessory jack for Com radios and MP3 players.Features:- A sensitive radio offers FM and AM reception, so that you may listen to music, your favorite sports team or talk radio show. - Aware technology allows you to hear the environment and communicate with coworkers while listening to the radio or auxiliary devices. - Com-680 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 Rating of 22 dB.- Excellent sound quality: oversized speakers.- Electronics in a protected compartments, separated from the ear cavity - Soft cushioned headband and replaceable ear cushions. - Ergonomic placement of controls for easy adjustment even with gloved hands. - Accessory jack/Input jack that allows connection of auxiliary devices, such as MP3 players, CD-players and communications radios. Device connected to the input jack, can be heard individually or at the same time as radio and Aware technology.