sound box Volume control,chargeable for Iphone eliminate radiation,3.5mmplug chargeable for cell-phone Playing music function Description:Multi-media docking station is a cell-phone partner specially designed for Iphone4/iphone 4s,and it totally support wire remote control unit to fulfill operation of cell-phone frequency player:"Next" "Rev" "Play" "Pause" "Vol +" "Vol -", answer calls, hand up, ...