Peripheral System Product Peripheral System F90 F80 K3 K2 K1 F90 [list:subtitle] radio-frequency region635.05-695.05MHzAvailable bandwidth30MHz per channel (60MHz in total)modulation systemFM frequency modulationNumber of channelsAutomatic infrared frequency matching 200 channel Discover F80 [list:subtitle] frequency range640—690MHzAdjustable channel number100*2Receiving modeHeterodyne secondary frequency conversionDebugging modeFrequency modulation (FM) Discover K3 [list:subtitle] Maximum input level of music port+14dBu（4V RMS）Maximum output level of output channel+14dBu（4V RMS）Music gain0dB、+3dB、+6dB（Three gears are optional）Microphone sensitivity64mV（Out：4V） Discover K2 [list:subtitle] Maximum input level of music port+14dBu（4V RMS）Maximum output level of output channel+14dBu（4V RMS）Music gain0dB、+3dB、+6dB（Three gears are optional）Microphone sensitivity64mV（Out：4V） Discover K1 [list:subtitle] frequency response（MUSIC、MIC）20Hz～20KHzinput sensitivity（MIC）11mV （MUSIC）210mVMusic Tone (10 dB) Seven-segment Parametric EqualizationSeven-stage parametric equalization of microphone tone (10 dB) Discover