The device has reserved DC interface, audio input AUX interface and headphone output port, and is compatible with XH2.54 interface. With rich product interfaces, users can freely choose according to their needs, making it more convenient to use.The onboard antenna can transmit up to 50 meters in an open environment without external antenna. The TYPE-C interface can be used for power supply/USB sound card. For the QCC5125 model, you can also connect to the official software through the USB interface to operate the EQ in the internal DSP, which is especially suitable for those with software foundation. Senior enthusiasts.The device is equipped with a 12S output interface, which can be connected to an amplifier with an I2S input function. The device comes with an acrylic shell and a fixed magnetic column, which is magnetically fixed and installed, and the operation is simple and fast. Designed "Cancel Bluetooth connection button", when an unknown Bluetooth device maliciously connects, long press the button for 3 seconds to cancel the connection of the unknown Bluetooth device. QCC5125+PCM5102A chipset realizes lossless transmission and decoding. The high frequency is delicate and burr-free, the mid-range is round, and the low frequency is powerful and elastic. Its excellent parameter performance includes a dynamic range of 112dB, a signal-to-noise ratio of 112dB, and a distortion of -93dB. Colour:Black Material:PCB+electronic components+acrylic the color of the installation accessories is random,don't accept the specified color Package Contents: 1x decoder board 1x acrylic case 1x screwdriver 3x cables 1set x installation accessories 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.