AVerMedia 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. The 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) and start to pair. Just power on the microphone and speaker and you do not need to worry about pairing and everything else. You can secure or hang the AVerMic AW315 against a wall or cabinet with its mounting-hole design. The AVerMic AW315 is built-in a ground loop noise isolator which can help to reduce the ground loop interference caused by a difference in ground potential and prevent EMI.