Volume control design: The digital-to-analog converter comes with a professional volume control knob, which can adjust the output volume of RCA and AUX, and supports simultaneous playback of speakers and headphones. Supports all sample rates: The digital-to-analog converter accepts uncompressed digital audio as input at sample rates of 192kHz/24bit, 96kHz, 48kHz, 44.1kHz, 32kHz and provides electromagnetic noise free transmission. Bluetooth: The digital-to-analog converter supports Bluetooth version 5.0. , AAC decoder and Bluetooth antenna with signal range up to 10 meters. Compatibility: The digital to analog audio converter is designed or professional audio signal switching. It converts coaxial, Toslink digital audio, stereo audio or Bluetooth signals to analog stereo audio signals. It is also a digital music player with a USB flash drive input and supports MP3, WAV, , FLAC and WMA lossless formats. Input Terminals: 1 x Coaxial Digital (Coaxial) Terminal, 1 x Optical Digital (SPDIF/Toslink) Audio Terminal Input: Coaxial or Optical Digital Audio Output: R/L (audio output connector) Audio input connection: Toslink, 1xRCA (coaxial) Audio output connection: 2xRCA (right/left) Support sampling rate 44.1 32., 48-96KHz playback Power input: AC 100-240V 50/60Hz Power supply: 5W (maximum) Colour: Black Material: ABS Size: 15.5 x 7.3 x 2.8cm Package Contents: 1 x digital to analog audio converter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.