Horn Stand Speaker Loudspeaker Amplifier Silicone for Apple iPhone 4 4G Blue Go ahead and toot your own horn with this silicone horn stand speaker for your iPhone 4 / 4S Wireless speaker amplifies the sound from your iPhone by concentrating and directing it through the horns tubing No external power needed to bring your music to life acoustically Speaker holds iPhone vertically or horizontally for comfort and hands-free viewing enjoyment Acoustic amplifier increases volume by 13dB Designed to withstand dust and scratches Charging port cutout at bottom for easy accessibility Holds iPhone vertically and horizontally, functions well in hand-free mode No external power needed,13 dB of volume amplifer