It is an audio selector (passive type) for Real Acoustics Studio. There are 4 input systems and 1 output system. It is an easy-to-use car with VOL. There are line marks on the exterior (Hiura Katsuji)
Maintenance information: 2024.4.28 sound output confirmed
Accessories: instruction manual connection cable original box
Main specifications: W150 x H60 x D120 mm weight 464 g