I just received this and ear piece today and as a Ham I am amazed at how clear the audio is
PMMN4024A: The PMMN4024A is Our Replacement for the Motorola XPR6550 Remote Speaker Microphone (Shoulder Microphone). Our Replacement Features loud, clear audio as well as a 3.5mm audio jack.
Compatible with: XPR6100 XPR6380 XPR6350 XPR6550 XPR6580 XPR7350 XPR7550
Replacement for Motorola PMMN4024A, PMMN4040A, PMMN4071A, PMMN4025A, PMMN4050A, PMMN4046A, PMMN4041B, PMMN4042B, PMMN4043A, PMMN4047A, PMMN4048A