Cyber Acoustics CA-MP50 Portable Stereo Speaker System (1 Piece Speaker) MP3 player and mobile phone stereo speaker system Operates on four AA batteries or AC adapter; 3.5mm cable for iPhone, iPod and MP3 players 3.5mm jack to 2.5mm plug cable for connection to most mobile phones Mini USB plug cable for Motorola mobile phones; Sony Ericsson plug cable for Sony Ericsson phones Includes soft carry case and four inter-changeable color inserts