... power amplifier 1.ISO,CE,FCC pass 2.strong anti-interference 3.teaching,conference,club 4.power amplifier DC 6V Wireless ... ;Output short circuit, overheat, overload, and alarm protection;strong anti-interference;the signal input is RCA and 3.5mm stereo audio ... automatically search for the transmitter signal and locked.5. No interference, no string frequency.6.tansmitt and receive: With strong signal ...