To be used with an amplifier and speaker, or amplified speaker

Can also be used in an Aux. Input on radio, allowing Onstar to play through the radio

For select 1999-2002 GM Trucks

Needed if Truck has onstar and uses 3plugs

This will be needed along with the aftermarket radio harness

Spealized Part for when installing an Aftermarket Stereo

No cutting of factory wiring needed