Adopt the world’s advanced DPLL digital phase-locked loop multi-channel frequency synthesis technology and automatic noise control technology.Using UHF600MHz~690MHz frequency band to avoid interference frequency.Dual microphone design, two people can sing at the same time with the invisible antenna of the handheld microphone.Using true diversity receiving circuit design to ensure continuous speed within the effective distance and eliminate dead ends.Using the latest high-frequency surface acoustic filter to filter out the out-of-band interference signal to the greatest extent.Using high frequency circuit design with double frequency conversion, it has extremely high sensitivity.Voice compression and expansion circuit, greatly improving the signal-to-noise ratio, unique voice compressor design, the singer will not crack the sound when singing hard.Using a high-gain antenna, effectively widening the use distance of up to 100 meters with a complete input and output interface, which is convenient for connecting various devices.Any microphone and any receiver in this system can be connected to the frequency, which completely solves the shortcomings of fixed-frequency microphones that are not universal, and is suitable for multiple sets of products to be used in the same occasion.Optional according to requirements of lavalier microphone or headset microphone