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1) Embedded amplifier
2) Support USB, SD card slot and MP3 format
3) Previous/next button, bass
4) Rated power: 4": 30W 5": 60W Maximum Power(W): 4": 100W 5": 120W
Impedance: 4Ω Sensitivity(db): 90DB
Frequency Response: : 60HZ-20kHZ Distortion Degree: 0.2%
5) FM radio function for option.
6) Optional surface material: PU Leather
7) Optional color: Red, black, grey, 8) Optional voltage: DC12V.
9)with High input/output 10)4": 16pcs/ctn 5": 12pcs/ctn
4"/5"Hexagon Shaped Car Subwoofer/USB Speaker