Professional 2 ways Active Speaker

JLD-QSK Series Professional 2 Ways speaker Tyep: Active Amplifier Function Description: 1), MP3 Player: MP3 Player controller and control digital display 2), MP3. in: Accepts signal from SD/MMC/MS Card and USB jack, supports MP3 and Wma format 3), Level: Adjusts signal of the MP3 Channel 4), Level: Adjusts signal of the Mic.in Channel 5), Mic.in: Accepts signal from microphone 6), Level: Adjusts singal level of the line in channel 7), Line in: Accepts line level signal from external music source, such as Mixer 8), Volume: Controls the output level for the unit 9), Treble: Raise or lower amount of high frequency by +/-12dB 10), Bass: Raise of lower amount of lower frequency by +/-12dB 11), Power Led: Lights up when power is on 12), Clip led: Lights up when system signal level approaches clipping. 13), Line out: Sends a mixed signal of the unit at line level. 14), AC Voltage: Selectro (115V or 230V) 15), AC Socket (with fuse link): Connects power card 16), Power switch: Turns power on/off Other Extra Optional function: a), Remote Control; b), Radio / FM; c): SPK OUT (run other passive speaker) Speakers Description: QSK12US: 12inch 300W 8Ohm Impedance QSK15US: 15inch 450W 8Ohm Impedance