This infrared wireless microphone system with the IR-820SP speaker is a PA system designed for use in the school classroom with a size of 10 m × 10 m (30 ft × 30 ft). The IR-820SP is a ceiling-mounted powered speaker with an infrared receiver that offers a wide frequency range with high-quality sound output. It features a digital amplifier for the amplification section and a full-range speaker for the speaker section. Use of the supplied mounting hardware and optional HY-TB1 Tile Bar Bridge allows it to be versatilely mounted to match a wide range of applications and installation locations. This speaker is combined with an infrared wireless microphone and the IR-802T infrared wireless tuner to make up the infrared wireless microphone system. The infrared microphone system eliminates problems with interference or eavesdropping, allowing for simultaneous use in adjacent school classrooms.