This adapter is too big and heavy to be of any practical use. It weights on the output of the computer, the phone, etc. This will cause damage to the output sockets.
The adapter I got was crackling and cutting out from day one. A very cheap Chinese made item. Look elsewhere. Sadly I threw away the little bag it came in so I can't return it.
p.s. Thomann why is the only "3.5 mm jack male stereo to 6.35 mm jack female stereo" adapter brand you sell. Come on Seetronic is a low quality adaptor!