1.Input:CD/PC/MP3,professional classroom audio solutions 2.Amplifier,receiver,loudspeaker 3.Power:2*50W,6. ... coil; 8.5 OZ; 4 Ohm1. Technology: 2.4GHz or Blue-tooth 2. 3 in1: receiver,amplifier,loudspeaker.3. Channels : It has ... .8. Input: Two MIC input,a line CD/MD/PC audio input,a line recording output.9.USB port: External USB ...