Question about the AV cable

[Fred456]

Hi

Hopefully someone here is a bit technical ?

If possible I wanna buy a long AV - RCA cable.

Will this be a correct one ?

(3m) 2.5mm 4 Pole Jack Plug to Triple RCA Cable AV Audio Video Lead TV Camera Cam

Is it 2.5mm for a MAG ?
I didn't had luck with a 3.5mm with composite AV

Thanks for helping