Description: Wide application: This audio for amplifier module is suitable for connecting with a wired or wireless speaker, and is easy to connect. USB port: This bluetooth-compatible for amplifier module allows you to connect a U-disk. You can switch to U-disk mode and play music via a U-disk. Other function: This audio for amplifier module can also be used as a computer sound card, providing a better audio signal than the computer audio quality. Adjustable: This wireless audio for amplifier module is designed with a knob, so you can easily adjust the volume and control music play. Remote control: This bluetooth-compatible audio for amplifier board allows you to use a phone app to control it, which is more convenient to operate. Specification: Input voltage: DC 8-24V. Bluetooth-compatible version: 5.0. Transmission range: Approx. 15m/49.21ft. Sound channel: Left and right(stereo). Suitable speaker: 30-200W, 4Ω, 8Ω, 16Ω. 12V→8Ω/10W+10W, 4Ω/16W+16W. 16V→8Ω/15W+15W, 4Ω/>20W+20W. 20V→8Ω/20W+20W, 4Ω/>20W+20W. 24V→8Ω/30W+30W, 4Ω/>30W+30W. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. for Amplifier board should keep away from WiFi Signal(Router). DC 8-24V power supply is recommended, the chip will burn out, if over 26V. The power supply should not be over 12V while connecting a 4Ω speaker, and should not be over 24V while connecting an 8Ω speaker. Over 2A power supply current is recommended. The heat sink is needed, when the module's working power is over 20Wx2. The speaker wire should not be too long, the proper length is within 1 meter. Be note of electrostatic for protection, release the electrostatic hands before touching the for amplifier board, prevent the electrostatic breakdown of the chip. The bluetooth-compatible chip is very sensitive to electrostatic. Over 30W rated power speaker is recommended to prevent the speaker from burning out due to the heat. for Protection board and heat sink need to be installed by oneself. Package Includes: 1 Set Bluetooth-compatible for Amplifier Board.