The device has reserved DC interface, audio input AUX interface and headphone output 1 port, and is compatible with XH2.54 interface. It provides a rich product interface, users can freely choose according to their needs, making it more convenient to use. The onboard antenna has a transmission distance of up to 50 meters in an open environment, without the need for an external antenna. If it is installed in a metal case, in order to avoid signal shielding, you can purchase an external antenna yourself and reserve an IPEX1 generation antenna base for installation. The TYPE-C interface can be used for power supply/USB sound card. For the QCC5125 model, the official software can also be connected through the USB interface to operate the EQ in the internal , which is especially suitable for senior enthusiasts with software foundation. The QCC5125+PCM5102A chipset realizes lossless transmission and decoding, perfectly displaying all dynamics and details of the sound. The high frequency is delicate and smooth, the midrange is , and the low frequency is powerful and elastic. High-quality fever capacitors are used in key parts, which perform well in parameters such as dissipation factor, leakage current, ripple current and , significantly improving the speed, dynamics, texture and density of sound, and improving the overall quality of high, medium and low frequencies. Especially obvious. Power supply requirements:DC:8-24V, or use 5V Type-C interface for power supply Bluetooth device name:, search and click to connect Dynamic range:112dB Signal-to-noise ratio:112dB Distortion:-93dB Shipping in disassembled. The product appearance and printed words depending on the batch, but this does not affect use. Colour:As Shown Material:PCB+Acrylic+Electronic Components Package Contents: 1 * QCC5125 Bluetooth 5.1 Decoder Board Kit 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.