Paging hand microphone with noise-canceling design makes it particularly effective for use in noisy locations and excellent voice response characteristics make it a good choice in quiet areas as well. Output impedance is 200 ohms for matching low impedance input circuits. A push-to-talk switch is located on the molded ABS microphone housing. A soft rubber lip guard assure user of correct microphone-to-mouth positioning. 450D is same as NC450D except without noise-cancellation. Molded Cycolac housing in pebble-grain black finish and unterminated black neoprene coil cord relieved at the housing by spring-type strain relief.