What are format and bit rate, What is audio format – Sony NWZ-S616FSLV User Manual

NWZ-S616FBLK, NWZ-S615F, NWZ-S615FBLK, NWZ-S615FPNK, NWZ-S615FRED, NWZ-S615FSLV, NWZ-S616F, NWZ-S618FBLK, NWZ-S618F, NWZ-S616FRED, NWZ-S616FPNK