Intelligent Charging Station with digital infrared audio processing and transmitting technologies ensure superb sound quality. IR transmission technology, no worries about eavesdropping and radio interference, no RF radiation. Unlimited quantity of infrared wireless conference systems within a building. Easy to set up, move and remove, no wiring or drilling, perfect solution for historic venues. Compact and highly efficient control unit with built-in infrared receiver. 1~8 MHz transmission frequency, undisturbed by HF driven light sources and mobile phones. IR coverage area radius?8 m (4 m high ceiling). Excellent immunity to RF interference from mobile phones and RF devices.