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South Korea The GD61 wireless speaker system from Le MON Technology Korea Co. Ltd uses a single USB dongle transmitter that allows it to broadcast digital audio files to its multiple portable satellite cube speakers. The model features 2.4GHz RF transmission with eight selectable frequency channels that can coexist with other 2.xGHz devices such as Bluetooth- and WLAN-enabled units. It has up to 30m operating range and is designed with a built-in PIFA antenna for optional external sleeve antenna support. The plug-and-play 2ch stereo unit delivers up to 0.7Vrms analog audio output and supports remote volume adjustment.