Motorola NNTN8383 IMPRES Industrial Noise-Cancelling Remote Speaker Microphone for XPR 6000, 7000 Series
Designed for extreme high noise and dirty environments. INC RSM is 25% louder than other MOTOTRBO microphones and uses dual microphone noise-cancelling technology.
Includes a threaded 3.5mm audio jack for a receive-only accessory, 6 foot coiled cord, volume control on microphone has Up/Down toggle with 8 steps and ramp on hold