1.The remote speaker microphone is replacement for PMMN4071AL PMMN4071A PMMN4071 PMMN4076 PMMN4076A PMMN4073 PMMN4073A PMMN4073AL mic. Compatible for hand radio XPR3000 XPR3300 XPR3300e XPR3000e XPR3500 XPR3500e etc. 2.The windporting feature is specifically designed for windy outdoor environments. 3.The noise canceling audio optimizes your sound when operating in noisy environment. 4.Clip-on speaker mic combined with PTT (Push to Talk) button. Clip holds on tight and will not fall off randomly. Cord is strong and coil allows for good flexibility and reach. 5.Use high engineering plastic, strong and environmentally friendly PU wire. 6.3.5mm audio jack is available for private communication.