Thank you for viewing. This is the room equalizer microphone that came with the Kenwood CD/MD receiver R-K700. The functions are as follows: It is believed to be usable with R-K801, R-K711, R-K1000, and R-K1, in addition to R-K700. ＜Functions＞ It can automatically create the optimal acoustic space according to the layout of the room and the placement of the equipment. Conventionally, the optimal acoustic space required adjusting the environment by moving the speakers, furniture, etc., while listening, which required time, effort, and specialized knowledge. By using this equalizer microphone, you can easily set the optimal acoustic space for the room in a short amount of time without actually moving anything.