This is an auction for the RG-7, a 10-band stereo graphic equalizer released by Sansui Electric in 1983. The RG-7 is a vintage device equipped with a pan pot function and an electronic BBD reverb circuit. It also has two microphone inputs, allowing for mixing with music sources, and can connect to electronic instruments such as guitars and synthesizers. It has an easy-to-see and operate design with LED indicators. Operational check items: ・Power on: OK Detailed checks have not been performed due to the lack of a suitable testing environment.