After receiving the bluetooth sent by the mobile phone and other devices, the unit directly outputs digital coaxial and optical fiber signals. The product can be connected to various DAC decoders, which is convenient and the sound quality is also guaranteed.The latest version also supports LDAC, Aptx HD, AAC, SBC, Android and Apple, LDAC supports 24BIT94K transmission can be compatible at the same time Really lossless transmission, the same level of sound quality as CD LDAC can reach up to 990kbps. Apt-X HD is up to 576kbps. Adopt dual power supply interface, more convenient to use. (DC interface or MICRO USB interface) A free external antenna is provided for stronger lossless signal transmission and better results. All signal input and output adopt fever components. Digital output has plastic chip and digital isolation transformer. Coaxial and optical fiber two output. Multi-channel independent voltage regulation function + CLC filtering, the work is more stable, and it has good results without a good power supply. The board has integrated LED indicators, the status is clear at a glance.Power supply (while ensuring better sound quality, more convenient for multiple occasions) More convenient dual power input interface, only need to connect one (any one can), there is no need to connect two. (Please use high-quality power supply, power supply can directly affect the sound quality) DC base input (5.5X2.1): 8-12V power supply DC adapter (more than 300MA). MICRO USB input: 5V micro usb charger (500MA or above).