AVerMic AW315 provides reliable operation with its dual-antenna to two wireless microphones. With 2.4 GHz wireless technology, noise and speaker buzz reduction, this hands-free design not only gives teacher total freedom to interact with students, it also delivers natural voice in great clarity and stability. Speaking all day in your 'teaching voice' can put undue strain on your voice, and can cause long term injury. Utilizing a microphone enables you to speak naturally where your students can still clearly hear you, reducing the potential for voice strain and vocal issues. AVerMic AW315 mode selector switch provides a simple selection in both Line out and Mic out modes. The Line out mode is suitable for common speaker systems with 3.5 mm Line In jacks, such as PC speakers or projectors with 15W or higher power speakers. The MIC out mode is suitable for classrooms with built-in audio systems and 6.3 mm microphone jacks. The microphone (TX) will automatically search for the receiver (RX