Used Nakamichi car audio head unit. This is a US model Nakamichi, which is not often seen in Japan. The list price was in dollars, and it seems to have been quite expensive. Since it's a US model, I don't know if the radio will work in Japan. Bluetooth is also available. It has three RCA outputs, so you can use it with an amplifier. I used it without an amplifier, but it still produced a powerful sound! USDM JDM Civic Accord Legend Pioneer KENWOOD Clarion Kicker