... horn stand for iphone 4g 1.100% silicone 2.non-toxic,anti-dust,non-stick 3.no external power ... needed 4.factory price cute silicone horn stand for iphone 4g ,holder ... silicone material,this soft silicone stand is with horn design which can reduce the friction in daily ... well in hand-free mode. 6. No external power needed,13db of volume amplified. 7. When you listen ...