This product is an audio decoder that converts fiber-optic signals and coaxial digital audio signals into analog audio signal. Support for Dolby AC-3/DTS and so on. It bring a shock effect to Families, schools, plazas, concert halls, cinemas and other places brought by DTS or Dolby sound field. Features: Automatic identification of fiber optic, coaxial input signals. Support 5.1-turn two-channel output. Panel design input audio channel indicator, clearly indicating the input audio format. Support automatic noise reduction function of switch machine. Support no signal input automatic mute function. It adopts aluminum alloy casing, full of texture and strong anti-interference. The output end uses RCA interface or 3.5mm headphone audio port, which is more convenient and quick to us. Ultra-thin wire, easy to store and carry. Specification: Type: Audio decoder Size: 12 * 7.4 * 2.5cm / 4.7 * 2.9 * 0.9in Package size: 18 * 14 * 5cm / 7.0 * 5.5 * 1.9in Net weight: 1g / 0.03oz Gross weight: 318g / 11.2oz Support audio formats: MP3, AC3, DTS, WAV, WMA, AAC, FLAC, APE, OGG, M4A, M3U8 SQ: 120db Resolution: 80db (1KHZ) Channel imbalance: 0db Sampling rate: 32~192 KHz Bit rate: 16~24 Bit Response frequency: 20Hz~20KHz +/-0.7db Total harmonic distortion (THD): 20Hz~20KHz 0.25-0.065% Total harmonic distortion + noise (THD) + N): 1KHz 0.15% Analog output level: 2.2V Product appearance size: 105 * 75 * 25mm / 4.1 * 2.9 * 0.9in Input interface: Fiber interface *1, coaxial interface *1 Output interface: RCA interface *6 Maximum workflow: 400mA Operating temperature / humidity: 0℃ - 70℃ / 10% - 80% RH (no condensation) Storage temperature / humidity: -10℃- 80℃ / 5% -90% RH (no condensation) Package List: 1 * Decoder 1 * Instruction Manual 1 * Power Adapter 1 * Optical Cable .