... training, monitor system 2.4G Wireless mini audio guide2.4G Digital wireless portable audio mini receiver wireless headphone SOYO-WTG2010-mini ... by a lot of advantages, such as small in size, highly integrated, high quality sound (with HDCD sound effect, and the ... channels manually. Spec:1. Transmit frequency 2400-2480 MHz; Real digital transmit;2. Channel & Volume Display function. Channel 40 Max; ...