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By certification 
Power supplier: DC 5 V
Output power: 5V1A
Frequency: 120HZ-18 KHZ
Signal & noise ratio:＞ 80 dB
Impedance:4 OHM(Ω)
Li-ion Output: 3.7 V~4.2 V+0.05 V
Li-ion Input: 5 V
Lithium battery: 2000 mAh
Speaker Unit: 31mm
Case Material: ABS
Dimensions: Dia 4.2*H 17.2 CM
Output power: 5V1A
Frequency: 120HZ-18 KHZ
Signal & noise ratio:＞ 80 dB
Impedance:4 OHM(Ω)
Li-ion Output: 3.7 V~4.2 V+0.05 V
Li-ion Input: 5 V
Lithium battery: 2000 mAh
Speaker Unit: 31mm
Case Material: ABS
Dimensions: Dia 4.2*H 17.2 CM
