It is used by TV to listen to music or to KLAOK.
9.5mm TV plug to 9.5mm TV jack, with absorbing ferrite gold
OD: 5mm
2RCA plug to 3.5mm stereo plug
OD: 2.6x5.2mm
6.35mm mono plug to 6.35mm mono jack
OD: 4mm
5p din plug to 4rca plug