2.0 Channel Bluetooth-compatible Subwoofer Amplifier Board 30W+30W Stereo Amplifier Board Metal Bass AMP 1Piece Features: Easy to turn on/off, super convenient to use.Overheating, overcurrent, short circuit, anti-static protection.The buttons are convenient and quick, and you can cut songs without a cell phone.Ten kinds of natural sounds Create unique natural sound scenarios, create a natural atmosphere, quickly calm down, and achieve deep sleep.Support custom 10-segment sound effects to adjust arbitrarily, make up for deficiencies, so that different speakers can achieve better sound effects.Specifications: Material: MetalSize: Approx. 6x5.7 cm/2.36x2.24 inAdapter Power: 9-24 V/3A AbovePackage Includes: 1x Bass AMP1x Screwdriver1x Screw Terminalnote: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.Due to the difference between different monitors, the picture may not reflect the actual color of the item.It is recommended to use 8Ω speaker, power supply 9-24V DC, no overvoltage.If driving a 4Ω speaker, the power supply cannot exceed 12V.