Can only advise the purchase !! Good for nothing !!

After I purchased this 5m extension on 02.01.2013 to hear with my Sennheiser headphones on the sofa music, I realized after unpacking fixed a loose connection at the connecting socket / cable. I constantly had to wiggle it to listen to both channels. So wrapped up again, drove to the post office and requested compensation. Today (09:01:13) was the replacement - what should I write: you can only hear mono, so again a fault in the cable or the plug / socket. DC pack again and this time I want my money back.

Conclusion: can only advise the purchase !!