Hama hk 220 behind neck stereo headphones hama 00056220 these behind neck stereo headphones from hama allow you to be pampered by the magnificent musical sound of the two 30mm diameter smart stereo earpieces taking you into a new world of wearing comfort equipped with 20 20 000 hertz speakers plus the sensitivity of 103db ensuring an excellent sound p whether on the bus train or in the waiting room the 1 2m long cable allows the speakers to be kept easy on the ears while the mp3 play