1: Small size 2: Stable performance 3: Easy to use 4: Decoding chip: PCM5102 5: Power supply voltage: AC6-20V/DC6-20V/DC5V This module is powered on without pressing any buttons. After power on, the blue light flashes, and after about 8 seconds, the blue light quickly flashes. Bluetooth enters pairing mode, and you can search for Bluetooth using your phone. When Bluetooth BT Speaker is found, click on the pairing link Bluetooth, and no password is required. After successful connection, the blue light remains on. At this point, the music can be played. Regarding noise issues, this board uses PCM5102 audio decoding, a linear power chip, and a fully audio dedicated high pass filter capacitor. The board itself does not have any noise, but if powered by a power amplifier, there may be common ground noise. Please use a separate power supply Power supply voltage: AC6-20V/DC6-20V/DC5V Current: 100MA Bluetooth chip: Qualcomm QCC3003 Decoding chip: PCM51025 Bluetooth version: 5.0 Support audio decoding formats: , AAC Colour:blue Material:plastic Package Contents: 1 x Qualcomm Bluetooth Decoder Board