portable mini spealer. application for mobile phone, MP3, MP4, PC and other audio output devices. Mini speaker.Can be connected to the mobile phone, MP3, MP4, PC and ... 3.6V.Lithium input: 4.2V ± 0.05V. Built-in lithium battery.Material: metal.Product size: diameter 5.2cmx height 8.3cm ... G.W. / N.W.: 12.4/11.4KGS.Accessories: USB cable, audio cable. USB Mini speaker for mobile phone, MP3, MP4, PC