◆ The chairman priority key with red color LED for identify and with the function to stop speaking of the delegate microphone with indicate sound. 
◆ The chairman unit with two electronics keys, which can control the main unit to change the conference mode at any moment to meet the current situation.
◆ Unit will turn off automatically over 30/45/60/90 seconds without speaking
◆ Limit Timing Mode- Limit the speaking times available for the conference unit.
◆ Built-in resonance room with dustproof and windproof cover and the front side of the microphone adopt holistic design, built-in quakeproof fixed microphone head, to avoid noise by touch and shake.