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A2DP Bluetooth protocol, the digital audio source output With optical fiber, coaxial interface can be connected directly to ground digital amplifier / DAC audio decoder with a digital interface and other audio devices Bluetooth is also a HIFI, also with RcA analog line output \ it can be used with common amplifier and active speakers Description: Original CSR Bluetooth chip FEIXIANG HIFI Bluetooth Audio Receiver Aluminium alloy shell Can be connected with the headphone amplifier, the amplifier with analog input interface and digital interface Interface: 2RCA- 2RCA With external antenna that can be disassembled and the signal is more stable Chip: CSR 57E6 Colorful LED indicator Rubber mat With 12V 1A power supply