... travel ,portable, super slim and mini size, easy to carry7, Material: Pure ABS+ metal loudspeaker netTechnical specifications: ... 2.4Frequency range: 80HZ-20KHZImpedance: 4Power Voltage: USB / DC 5.0 VAccessory : Audio cable ,USB cable, lanyard , lithium battery ,manual. Warranty Card. ... travel ,portable, super slim and mini size, easy to carry7, Material: Pure ABS+ metal loudspeaker net Technical ...