This is a Motorola Speaker Mic model # PMMN4002B. 
This Speaker mic will work on any GP328,GP338,PRO5150,PRO7150,  HT750,HT1250,HT1550,GP320, GP340,GP360,GP380,XTS750, MTX900,MTX960,PR860,PTX700, PTX760,PTX781 etc... 
This clip on the back of the mic will rotate in any position.Come with 360 degree swivel lapel clip on the back of the microphone.With 2.5mm Earphone jack on Top .This is an "as-is" no return or refund auction.Shipping will be to CONUS only