Portable mini speaker,louder speaker,computer speaker Portable mini speaker,louder speaker,computer speakerBuilt-in lithium battery built-in digital amplifier Rate power: 2W x 2Frequency range150HZ~20KHZHzImpedance: 4HM(Ω);Speaker unit:40mm;Input voltage: DC5(V) Frequency response: 50/60HZHz.... Portable mini speaker,louder speaker,computer speaker