These are absolute rubbish- the box is very difficult to open and the silly little holder was jammed in the case. Changing the rubber ear bud is very fiddly if you have to do this. You can't get the cable back in the holder because it is too small.
Finally, the sound is thin and tinny. No 'heavy bass' here.!!
Difficult to get the tubes in and not getting caught. Finally got got them in a reasonable position. Lid won't close so I had to jam the sensor slot. Now it just says 'cartridge not recognized' put old carts back in and these are now also showing errors. after much mucking about got the old carts to show up again. put the CSS back in and it didn't work.