Don't waste your money buying those useless FM modulators. I bought one 2 years ago, and I only used it once, tapos tinabi ko na. As the others have said, sound quality is the pits. Naka max na volume na HU ko, halos di ko pa din marinig. And I tried all 4 available FM stations. Sayang ang P400 petot ko, until now, masama pa rin loob ko, hehehe.

Better save up and get those entry level HU's by Sony or Pioneer na may USB/SD card slots or Aux-In.