Thank you for viewing. Japanese Antenna CATV Upstream Amplifier. This item was generated due to the cancellation of a J-COM internet service, and I was told it was not necessary to return it upon cancellation. It was used and working until June of this year. Since then, it has been removed, so the operation has not been confirmed. Everything in the photos is included. Please understand that this is an as-is sale. Also, please purchase only if you understand its purpose.