The Sheepdog Surveillance Series 2-Wire Earpiece Microphone with Noise Reduction Mic is a discreet acoustic tube earpiece with a 36 inch PTT cable that can be run down the user's sleeve or clipped to the front of the user's shirt. Reinforced earphone clip provides cable retention and eliminates strain on the headset earphone. Ideal for Security, Police and Business. The rugged housing is built with durable polycarbonate and easy to use PTT switch. The mic element delivers high quality audio and the high quality transducer routes clear receive audio to the user's ear. Can be worn left or right. Replaceable tube with standard eartip. Compatible with Motorola Vertex Standard EVX-261, EVX-264, EVX-531, EVX-534, EVX-539, VX-10, VX-130, VX-160, VX-180, VX-210, VX-210A, VX-230, VX-231, VX-261, VX-264, VX-300, VX-350, VX-351, VX-354, VX-400, VX-410, VX-417, VX-420, VX-426, VX-427, VX-450, VX-451, VX-454, and VX-459 two way radios.