Intrinsically safe radio conforms to all aspect of USTC (U.S. Testing Company) certification for portable used in hazardous locations. If further exceeds this by being fully submersible to 5 meters depth for up to one hour. Meeting MIL STD 810C/D/E rating for tough, enduring performance, the radio conforms to stringent standards, enabling it to withstand the every day rigorous of shock, vibration and the corrosive action of dust and moisture, ensuring of many years of trouble free use even in a salt water environment. Very simple to use, with the majority of its features accessed by a single key depression. Latest compander noise reduction technology delivers loud and crisp audio no matter what environment you are in.