Specification 1.Contemporay and sleek design stereo audio system; 2.Built-in li-ion battery,no need extra battery is required; 3.Buit-in digital amplifier,saving energy; 4.With storable 3.5mm jack audio cable; 5.Customized colors and logos are welcome; 6.Ideal for gifts and promotional items 7.compatible with all portable audio devices. 8.Power output:RMS 2W*2,THD+N1% 9.Frequency response:50Hz 20KHz 10.Input Voltage:DC 5V 11.Speaker unit:36mm,4Ω 2W 12.Buit-in Battery:Lithium-in Battery 13.SNR: >90db 14.Case material:Pure ABS 15.Dimensions:106*48*26mm 16.Weight:90 17.accessories:Speaker(1pcs) USB line(1pcs) 3.5(mm)jack line