Greco Head Phone Amp HPA-1 - Opened, Unused Thank you for viewing. This is a set of the amplifier and headphones. I only confirmed power-on for the purpose of listing, but it is almost unused. There is no liquid leakage. The outer box was tattered due to aging, so this is a listing of the main unit only. (The instruction manual was attached to the back cover, so it is deteriorated, but I will include it ※Image 9) I will ship within 24 hours. Thank you.