Low-impedance, gooseneck microphone for single-zone paging. Designed for applications where ruggedness, dependability and durability are the main requirements. Microphone housing is constructed of die-cast zinc alloy to stand up to the toughest abuse and conditions. Features a recessed aluminum grille with windscreen and a durable satin-chrome finish. All units include a heavyduty, 3-hole mounting flange and an extra-strength 16-inch flex arm of steel tubing. SR785LNO includes a push button switch with normally open switching. SR785L Same as SR785LNO except without normally open switching 785L Same as SR785LNO except without a switch.