Features: This product is designed for professional audio signals, can easily convert coaxial orToslink interface to RCA- analog audio interface and 3.5mm headphone jack. The professional audio amplifier chip and volume adjustment knob are designed to directly drive the headphones and adjust the output volume. The product also designed a bass adjustment knob, which can easily control the bass component to meet different customer needs. One optical fiber and one coaxial input interface.forDVD, HD-player and other devices; One RCA output interface, connected to the power amplifier system; 3.5mm audio output interface, Connected to headphones. Specifications: Item: Digital to Analog Audio Converter Support 192kHz 24bit sampling rate. Support volume adjustment Support bass adjustment Material: Metal shell, anti-interference Support system: all Resolution: 192KHZ Size:approx 76mm x70mm x16mm/2.99x2.70x0.63in Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1PC Audio Converter