... Push-to-Talk feature.Compatible with the following Motorola radios:CP Series:CP88,CP040,CP100,CP110,CP125,CP150,CP200,CP250,CP300SP ... ,GP88SXTN Series: XTN446, XTN500, XTN600XTN XV Series: XV1100, XV2100, XV2600, XV4100XTN AX Series: AXV5100,AXU4100CT Series:CT150,CT250,CT450,CT450LSPRO Series:PRO1150,PRO2150,PRO3150P Series:P040 ...