... 5.no interference,no distortion Dual-Channel Classroom Audio Receiver( RX-666A)Feature/Function:1.It is built-in 2.4G ... supplyAC 220V±10%/50HzMORE PICTURES: 2-Channel Bluetooth Sound Receiver( RX-666A)with wireless microphone to choose 2-Channel Bluetooth Sound ... Receiver( RX-666A)with speakersPAYMENT:L/C,T/T,WESTERN UNION,ALIPAY ...