详细规格-教学机ActiveMicrophoneSystemFUNCTION:INDOOR/OUTDOORTEACHINGPURPOSESEMINAR/MEETING/SPEECHPROMOTINGFAIRCONVENTIONGROUPACTIVITY/STAGESHOWTRAITS:RECHARGABLECIRCUITDESIGN/ECONOMICALCONVENIENCEMULTIPLE-USINGPURPOSEFORONSHOULDERORONNECK.RECHARGABLEBATTERY,NOLIMITIONATANYPLACELOUDSOUND,HI-QUALITYMAGENETICHORNSAVEENERGYACCOMPANYWITHPIN/HEADWORNMIC