Usage Tips:This device can distribute one optical fiber digital audio signal to two signals ,which connects to two sets of power amplifier system.Built-in Bluetooth mitter function ,which can help users with easily connecting high-quality digital audio signals to Bluetooth receiving devices, likes Bluetooth headphones and Bluetooth speakers. Built-in version 5.3 receiving and mitting integrated high-tech Bluetooth module, the mitting mode supports the simultaneous connection of two pairs of Bluetooth headsets or Bluetooth speakers; the receiving mode supports the connection of mobile devices such as mobile phones and ipads; Support digital audio to analog audio conversion signal. Support Bluetooth automatic search and connection receiver. Using Bluetooth dedicated antenna, the signal spreads stably. Support Bluetooth connection indicator. Built-in high-performance DAC chip, support 192K / 24bit sampling rate. Support 1 optical interface and 1 coaxial input interface. And a RCA and a 3.5mm audio output interface. Support output volume adjustment. Ultra low power consumption. Support power-off memory, Bluetooth automatic connection function. Colour:black Material:Aluminum alloy Package Contents: 1 x DAC Converter 1 x USB Cable 1 x Audio Cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection 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.