... digital speaker for your convenience, connecting to your MP3,MP4, CD, DVD, GPS, PSP, mobile phone, notebook computer, Hi-fi speaker ... ratio of power amplifier: ≥80Dbl Loud speaker 1.77 inches (external diameter 45mm) Magnetic resistant 4Ohmsl Power supply: 5V/1000Ma AC ... the next order if it is so. More photos: Portable cd player with mini speakers-xkd3