With exquisite shell, it has been assembled at the factory. The shell can well shield the external magnetic field interference and reduce the background noise. The external 2.4G Bluetooth antenna has a longer transmission distance of more than 30 meters and the Bluetooth is more stable. The internal isolated power supply eliminates the interference problem between the decoder board and the power supply, amplifier, and audio cable. There is no background noise and current sound, which improves the sound quality and reduces the troubles of customers. The TYPEC USB interface can realize the connection of PC sound card or USB power supply. QCC5125+PCM5102A, lossless transmission, lossless decoding, no loss, perfectly display the dynamics and details of the sound, high frequency without burrs, mid-range round, low frequency powerful, good elasticity. Extremely high parameter performance: dynamic 112dB, signal-to-noise ratio 112dB, distortion -93dB, no comparison, no harm. The key parts use fever capacitors, which perform well in parameters such as dissipation factor, leakage current, ripple current, , etc., improve the speed, dynamics, texture, density parameters of the sound, and improve the overall quality of the high, medium and low frequencies. Different temperatures, voltages, and frequencies affect the sound quality, and a good dissipation factor can reduce the impact. Small leakage current of capacitors reduces aging and prolongs life, reduces noise, and low reduces high-frequency impedance and increases dynamic response speed. With Bluetooth unpairing button, press and hold for 3 seconds to cancel Bluetooth connection, and short press to pause music. Bluetooth version: QCC5125 model 5.1 Bluetooth chip QCC5125 chip: PCM5102A Transmission code: , AAC, , -LL, -HD, LDAC Colour:Black Material:PCB Package Contents: 1 * Bluetooth decoder receiver 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.