The PMMN4069 is a Motorola Original Remote Speaker Mic. The PMMN4069 Speaker Mic Special Features are IMPRES Smart, 3.5mm accessory port. Has a large head for ease of use when operating with gloves. It has the same speaker as the APX portable radio and delivers audio that is clearer, more intelligible and up to 50% louder than XTS-series remote speaker microphones. IMPRES audio enables communication between the microphone and radio, optimizing the microphone's speaker output and microphone sensitivity, resulting in more consistent output across all radio accessories