Digital IR Wireless Conference Unit. Tabletop, intuitive and ergonomic design. Based on TAIDEN proprietary dirATC digital infrared Audio Transmitting and Control technologies. Compliant with IEC 60914. DQPSK digital modulation/demodulation technology. Up to 200 discussion units in a system A unique ID can be assigned to each discussion unit in one system for easy configuration. 1~8 MHz transmission frequency, undisturbed by HF driven light sources and mobile phones. Automatic adjustment of infrared emission power. Built-in rechargeable lithium battery, operation duration about 8 hours.