portable mini spealer, Material:metal, perfect sound. application for mobile phone,MP3,MP4,PC and other audio output devices Output power: ... outer magnetic 4 ohm;Line Input / Output: 3.5mm stereo plug;Power Input: DC 5V, 1000mA power adapter, USB power.Play ... .4/17.4KGS;Accessories: USB cable, audio cable. Portable speaker for mobile phone, MP3, MP4, PC, etc