The Con-Space SR65m Radio Accessory is as intrinsicall safe as the radio it is connected to. The SR65m allows radio users to communicate while wearing any make/model of face mask, breathing apparatus, respirator or protective clothing while in a hazardous or high noise work environment. The SR65m interfaces with most current models of portable radios. This unique radio accessory has no battery and uses the Con Space Throat Mic, a proprietary device designed specifically to give clear speech and comfort under abnormal work conditions. It comes equipped with it's own Push-to-Talk switch. Contact us at 1-800-346-7673 to discuss your particular model of radio and the accessories that can be purchased with it.