1.Built-in digital amplifier 2.Built-in lithium battery ,5 Times long playback 3.Power output: RMS 2W*2,THD+N1%4.Frequency response: 50Hz~20KHz5.Input Voltage: DC 5V6.Speaker unit: 36mm,4Ω 2W7.SNR: >90db8.Case material: Pure ABS9.Dimensions: Φ40,125*95*40mm10.Weight: 95g 11.Color: Red/White/Blue/Pink/Black etc.