With exquisite shell, it has been assembled at factory. The shell can well shield external magnetic field interference and reduce background noise. The external 2.4G Bluetooth antenna has a longer transmission distance of more than 30 meters and Bluetooth is more stable. The internal isolated power supply eliminates interference problem between decoder board and power supply, amplifier, and audio cable. There is no background noise and current sound, which improves sound quality and reduces troubles of customers. The TYPEC USB interface can realize connection of PC sound card or USB power supply. QCC5125+PCM5102A, lossless transmission, lossless decoding, no loss, perfectly display dynamics and details of 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 speed, dynamics, texture, density parameters of sound, and improve overall quality of high, medium and low frequencies. Different temperatures, voltages, and frequencies will affect sound quality, and a good dissipation factor can reduce 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 above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.