Philips Fidelio Portable iPod Speaker Dock, DS7550/37B , Refurbished: * wOOx technology for rich and precise bass * DBB to preserve low tones * Shielding technology to block mobile phone interference * Elegant, slim and compact design * Aluminum finish and cover case * Built-in rechargeable battery * Battery or AC powered * Dock any iPod or iPhone * Auxiliary input for easy connection to other audio devices * Free Fidelio app