Featuring level-dependent Aware Technology, ISOtunes LINK Aware is an over-ear hearing protector built to be worn all day long. Communicate with colleagues and listen for warning signals all while enjoying nonstop certified protection. Microphones allow you to listen safely to the world around you. Now you can hear warning signals, approaching vehicles, and colleagues. Aware Technology filters loud sudden sounds within 2 milliseconds so you are protected from the most damaging noises.