Heavy Duty Remote Speaker Mic With PTT Button. This rugged Remote Speaker Mic provides a simple hands free solution for heavy duty use. Easy-to-use design with large, snap action Push-To-Talk (TM) button. New bottom connector is secured into bottom cap via metal hooks. This remote speaker mic is also Intrinsically Safe when used as part of a Certified Intrinsically Safe Communications System. Ideal solution for construction, petrochemical, manufacturing, public safety, transportation, and other high-noise industries.