The wireless Conference System adopt ISM 2.4G digital Audio Frequency, automatically filters out radio interference. W22 Adopt ISM 2.4G digital Audio Frequency, automatically filters out radio interference. Smart ID code identifying synchronization technology, and can be very easy to achieve multiple installation. Comprehensive application of digital audio processing technology, sound to restore the true, clear and natural.Pre-set 16 selected channels, support multiple installation in KTV rooms without interference.Efficient battery power consumption design, the microphone can work continuously for five hours. Standard 19-inch mounting dimensions. It is suitable for the use of school and home entertainment. W85 using UHF 600-999 MHz band to avert interferencing frequency; True diversity receiver, guarantees no dead spot in working area; Adopt advanced digital pilot technology, preset 30 group frequencies, 8 frequencies; In each group, it can ensure 200 sets use together without interference; Automatic frequency scan feature searches for available frequencies; PLL system. Preset 240 non-interfered channels, adjustable 600 free frequencies; Designed for KTV rooms and stage use.