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The firm metal shell strengthens the frequency group system, each group of most 12 compatible frequency high quality's pure diversity reception technology leading tone static chirp technology may when the transmitter shuts down removes the wireless radio-frequency interference automatic frequency scanning function to be possible to seek for the audio frequency frequency range which automatically the allowed frequency strengthens using the infrared contact surface and the wireless transmitter frequency has the more controllable option user friendly menu operations to have the presente in figures and diagrams display monitor which the back light illuminates to be possible to avoid the accident changing the establishment the automatic lockout function HDX noise reduction to bring the quartz limpid sound receiver by 4 stage demonstration transmitter battery condition hand-hold radio microphone to be possible with the evolution series relaxed exchange words cup integration frequency balancer, the sound inspectionThe pattern suits the different demand the rich system fitting