RM20 is an omnidirectional microphone with 3 built-in microphone arrays, using microphone dynamic voice enhancement technology, and the sound quality is clearer, providing HD, full-duplex audio solution. Built-in speakers, adaptive high-definition amplification technology, professional acoustic design, reduce sound interference, provide exceptional sound effects. Plug and play, small and portable, easy to use and carry. Inductive button design, more durable and also for dustproof.