1. Silent fan: reduce the overall temperature of the module, for the power supply, amplifier chip, filter capacitors and other heat dissipation, reduce the temperature rise and the impact of temperature rise on the sound quality, to ensure that the components of the long-term stability of work
2. Dial keys: easy to operate
3. Bluetooth version: 5.0 (no cover, 15 meters)
4. Input mode: AUX+Bluetooth+USB (dial-wheel button to switch modes and songs)
5. Number of channels: 2.1 channels (left channel + right channel + subwoofer)
6. Amplifier chip: TDA7498E
7. Adaptable power supply: DC 15-36V (below 9V undervoltage protection, can also support 12V power supply)
8. Adaptable speakers: 30-200W, 4-8 ohms.
9. Output speakers: less than 160W for left and right channels, less than 220W for subwoofer
10. Protection mechanism: anti-reverse connection/under-voltage/overheating/short-circuit protection
11. Size: about 14.5 x 12.6 x 2.8cm
12. Weight: about 327g

Attention:
1. Sufficient output power will only be available if the audio signal input is large enough and the power supply voltage/current is high enough
2. The higher the power supply voltage, the higher the output power, the lower the speaker impedance, the higher the output power, please ensure that the power of the adapted power supply is greater than the actual working power of the amplifier