... music, connecting your MP3, MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, U disk and SD card etc ... ratio of power amplifier :>=80Db Loud Speaker: 1.77 inch (external diameter 45mm), Magnetic resistant 4 Ohms Power supply: 5V/1000mA ... USB Power rotate connect line (can choose), Built in Rechargeable Li-ion Battery Colors Available: pink,black,green, silver, blue Package Includes ...