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GTDAudio, A premier wireless microphone power amplifier, ( apply to G-622, G-733, G-788, G-787 models only ) 3, Manual channel selection:. Amazon.com: GTD Audio Wireless Microphone Antenna for G-622, G-733, G-788, G-787 Receiver : Musical Instruments. GTD Audio 2x800 Channel UHF Diversity Wireless Hand-held Microphone Karaoke Mic System 733 (2 Hand held mics). 4.4 out of 5 stars 309.