one new Original Pioneer CXC3172 Remote Control 

may work with many models including.

CDXFM1287 CDXFM1289 CDXFM687

1 original CR2025 button battery included as well, no guarantee on battery as they are sealed but have been in storage and are a consumable item. You can get them at dollar stores, hardware stores, pharmacies etc cheap. Plan on getting a fresh one if you have any issues.