The Concert To Go by i.Sound is an amplified portable speaker case ideal for iPhone, iPod, Smartphones, MP3 players and any audio device with a 3.5mm audio jack. Place your device securely in the inner mesh pocket and zip the case closed for protection and storage. Take the Concert To Go anywhere--a picnic, camping, the beach... Or anywhere that you want to listen to your favorite music in deep, clear, high-quality stereo sound! Requires 3 AAA batteries (not included).