Features 1、The device is equipped with reserved DCinterface, audio input AUX interface, and headphone output port, and is compatible with XH2.54 interface, providing rich product interfaces for users to freely choose according to their needs, making it more convenient to use. 2、Onboard antenna, with an open transmission distance of about 50 meters, there is no need for an external antenna. If installed in a metal case to avoids signal shielding, you can purchase an external antenna for installation and reserve an IPEX antenna base. 3、The TypeC interface can be used for powersupply/USB sound card. For the QCC5125 model, official software can also be connected through the USB interface to operate the EQ in the internal DSP, making it particularly suitable for experienced software enthusiasts. 4、The device is equipped with an I2S output interface, which can be connected to amplifiers with I2S input function. At the same time, a button expansion interface is reserved to achieves functions such as switching songs, adjusting/playing sound, pausing, etc., with strong expandability. 5、The equipment comes with an acrylic case and a fixed magnetic column, which is installed with magnetic adsorption for easy and quick operation. 6、Design a 'Cancel BT Connection Button'. When an unknown BT device maliciously connects, long press the button for 3 seconds to cancel the connection of the unknown BT device. 7、Fine quality capacitors are used in keyAreas, which perform well in parameters such as dissipation factor, leakage current, ripple current, and ESR, significantly improving the speed dynamics, texture, and density of sound, and particularly enhancing the overall quality of high, medium, and low frequencies. The capacitance has fine dissipation factor, which can effectively reduce the impact of temperature, voltage, and frequency on sound quality. Capacitors with low leakage current not only reduce aging rate and prolong service time, but also significantly reduce noise. Low ESR capacitance can reduce high-frequency impedance, improve dynamic response speed, and enhance sound performances. Specification Main color: black Item size: 74 * 43 * 26mm / 2.9 * 1.7 * 1.0in Item weight: 43g / 1.5ounce Package size: 100 * 60 * 50mm / 3.9 2.4 * 2.0in Package weight: 71g / 2.5ounce Package List 1 * Decoding Board