All goods for sale are authentic and genuine. Condition: Used Frequency response: 30 to 50 kHz Residual noise: 0.1mV or less Compatible headphone impedance: 30 to 200O Sensitivity: 1mW output at 0.26V input (50O load) External dimensions: 136W x 53H x 268Dmm. Please let us know within 3 days of getting the item. International Buyers - Please Note. This item is in the category "Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps".The seller is "lionjapantyo" and is located in this country: JP. This item can be shipped worldwide.