This is a compact pre-main amplifier from Olasonic. It is not the improved UA1a model. I am selling it because I am replacing my amplifier. 【Product Condition】 Sound output from the UAB and OPT inputs is not a problem. (COAX and LINE inputs are untested, so their functionality is unknown. Please understand this before purchasing.) There are minor stains, slight paint peeling, and small scratches on the main unit and remote control. It was used in a non-smoking environment. 【Included Items】 ・Remote control ・Power adapter, power cable 【Product Specifications】 ■Inputs: USB (Type B), OPT (Optical Digital), COAX (Coaxial Digital), LINE (Analog/3.5mm Stereo Mini) ■Audio Formats: [USB] up to 96kHz/24bit (Linear PCM) [OPT/COAX] up to 192kHz/24bit (Linear PCM) ■USB Connection Environment: Mac OS9.1 / OS X10.1 or later, Windows XP / Vista / 7 / 8 ■Speaker Output: 26W + 26W (4Ω), 13W + 13W (8Ω) ■Headphone Output: 54mW + 54mW (300Ω), φ3.5mm Stereo Mini Jack ■Amplifier System: SCDS (Super Charged Drive System) ■Frequency Response: 5Hz ～ 80,000Hz (at 1W output) ■Power Supply: AC100V ～ 240V (using AC power adapter) ■Power Consumption: Approximately 5W when silent, approximately 20W at maximum output ■Accessories: Remote control, AC power adapter, USB cable