portable mini speaker 1.Li-ion battery mini speaker 2.link to mobile phone,MP3,MP4, ... ,THD10%)Frequency:200Hz——20KHzSignal&noise ratio≥65dBImpedance:4 OHM(Ω)Li-ion Output:5V Li-ion Input:3.7V~4.2V+0.05V Lithium battery ... Material:ABSDimensions:Dia52mmXH4.2mmWeight:51gColor:Blue, Silver,RedBlack,Pink,Red Li-ion battery mini speakerFunction: (1) Can play music by link to ...