2.4GHz wireless technology Utilizing wireless technology, the AW313 maintains constant connection to the receiver, while reducing signal loss or channel interference issues. Unlike IR mics that require line-of-sight, or FM mics that have channel limitations, the AW313 stays connected for clear, stable audio. Connects to virtually any classroom audio system The plug-n-play wireless receiver simply connects into any speaker or audio system with a 3.5mm mic or line-in input jack so you do not need to replace or add any other audio components. If your projector has a speaker, you can even turn that into your voice amplification system! Protect your voice from strain Speaking all day in your "teacher 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.Quick and simple Simply plug the receive into your audio or speaker system, turn on both units and it will automatically connect for clear classroom voice audio.