Pioneer CD-VC1 Voice Command Pack For use with the AVH-P6400CD, AVH-P6400, AVM-P7000R and all other IP- Bus Source Head units, including DEH-P8500MP Affords fingertip control over volume, mute, source selection (AM, FM, CD, etc.), up/down/left/right cursors, and audio settings For use with Pioneer's IP-Bus receivers (compatible receivers will have a P in the model number) Dimensions - 1-15/16 W x 2-7/8 H x 1-1/8 D