Thank you for viewing. Please check the profile section first. [Product Name] FOSTEX HP-A4 2ch DA Converter Headphone Amplifier [Model Number] HP-A4 [Serial Number (S/N)] 0963812 RS Type: Headphone Amplifier Shape: Stationary Output: 100mW at 32Ω load 20mW at 300Ω load Power Supply: USB Supported OS: WindowsXP (32-bit SP2 or later *64-bit not supported) / Vista / 7 / 8 / 8.1 / 10 (FOSTEX USB Audio Driver installation required) MacOS X 10.6～ Width x Height x Depth: 113 x 34 x 155 mm Weight: 500g [Year of Release] November 2013 [Included Accessories] Main unit, USB cable x 2, Instruction manual, Outer box [Product Condition] Minor scratches are visible As this is a secondary distribution product, the details of the usage period are unknown. #FOSTEX #neetfagel Z01731 Please ask any questions or if you have any uncertainties in the comments section.