Velleman super stereo ear kit velleman mk136 a stereo audio amplifier which boosts sound around 50 times br br iframe width 560 height 315 src https www youtube com embed bnpm u344bm list plmkmpkapbzoirdrngpjzvkodxva9z6lu2 frameborder 0 allowfullscreen iframe br br velleman mk136 super stereo ear kit