silicone amplifier for iphone 4 1. iphone 4 accessories 2. high quality silicone 3. washable and durable silicone amplifier for iphone 4, silicone horn for iphone 4, silicone speaker for iphone 4 1.Hold your mobile phone vertically ,functions well in hand-free mode ,perfect life assistant. 2.no external power needed.3.Compact and lightweight design ,easy to take with.4.Durable ,flexible and tough ...