UHF wireless transmission technology for flexible installation and portable for rental use. UHF wide frequency bandwidth of 740MHz to 790MHz for stable signal transmission. Meet the needs for secure and interference-free communication and discussion conference systems. Minimum equipment to set up a basic conference system in a short time. Ideal use for the board room, conference room, and meeting room for hotel, office, and government. Wireless conference system with basic discussion function. Discussion chairman unit for audio conference system. Chairman unit with priority over delegate unit when speech. Chairman unit can turn off the delegate unit speech. The system supports only the chairman's speech mode without any interruption from others. Delegate units could speech only after the chairman unit exited the “Chairman Mode”. Built-in 3W hi-fi monitor speaker. Built-in lithium rechargeable battery, which supports 16 hours of speech use and 60 hours of standby. LCD screen English displays the ID, signal level, battery & microphone status, and control channel. The microphone is designed with a round ring indicator for the microphone. The gooseneck microphone is pluggable for easy installation and replacement. There are three buttons to set up the ID, control channel, volume up and down. Power standby automatically when there is no operation within 99 seconds. The microphone will be power off within 60 seconds when there is a system error.