Racing Radios two-way headset is used in every form of racing around the globe. Features include: 150 ohm noise canceling dynamic microphone, foam ear seal, comfortable behind the head fit, 32 ohm speakers, 23db NRR, PTT button on right cup, universal 5 pin connector for cable to radio. This two-way headset also features built in scanner port on left earcup to plug in existing scanner for 2nd audio feed. (Headset cable for radio not included).