The Pioneer ND-TMC10 Traffic Tuner is a Traffic Message Channel (TMC) receiver module designed for use with Pioneer GPS devices. It allows you to receive real-time traffic information, helping you to avoid traffic congestion and find the fastest routes to your destination. The ND-TMC10 receives traffic data from FM radio stations, providing accurate and up-to-date information on accidents, road closures, and other traffic incidents. With this module, you can receive visual and audible alerts for traffic events along your route, allowing you to make informed decisions and adjust your journey accordingly. The ND-TMC10 is compatible with select Pioneer GPS devices, making it a convenient and valuable accessory for your navigation system.