... CD/PC/MP3,professional classroom audio solutions 2.Amplifier,receiver,loudspeaker 3.Power:2*50W,6.5inch active speaker 3 in 1 Active Loudpeaker,3 ... 4 Ohm1. Technology: 2.4GHz or Blue-tooth 2. 3 in1: receiver,amplifier,loudspeaker.3. Channels : It has more than 1000 channels.4 ... the same frequency.5. Linking time: The receiver connect with transmitter in just 3 seconds.6. Loudspeaker type: wide-band horn ...