1. With exquisite shell, the shell can well shield the external magnetic field interference and reduce the background noise. 2. External 2.4G Bluetooth antenna, the mission distance is more than 30 meters, and the Bluetooth is more stable. 3. The internal isolation power supply eliminates the interference problem between the decoder board and the power supply, amplifier, and audio cable, without background noise and current sound, improving the sound quality and reducing the troubles of customers. 4. TYPE-C USB interface can realize PC sound card connection or USB power supply. 5. QCC5125+PCM5102A, lossless mission, lossless decoding, no loss, perfectly showing 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. 6. Fever capacitors are used in key parts, which perform well in parameters such as dissipation factor, leakage current, ripple current, , etc., improve the speed, dynamics, texture, and 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. The small leakage current of the capacitor reduces the degree of aging and prolongs the life, reduces noise, and the low reduces high-frequency impedance and increases the dynamic response speed. 7. With Bluetooth unpairing button, and hold for 3 seconds to cancel the Bluetooth connection, and and hold for a short time to pause the music. Colour:black Material:Metal The actual product may have slight color difference or difference, which not affect the use Package Contents: 1 * Bluetooth decoder 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.