The PMLN6530A Two-Wire Surveillance Kit. It receives and transmits operation with a Push-to-Talk(PTT) on the Mic.
 
Compatible with Motorola Two Way Radio 2-Pin models: GP88,CP040,CP100,CP110,CP125,CP150,CP200,CP250,CP300,GP2000,GP2100,GP300,GP308,GP68,GP88,GP88S,CLS1110,CLS1410,CLS1413,CLS1450,CLS1450C,CLS1450CB,VL50.