Features: Send a screwdriver, easy to install. Easy to turn on/off, super convenient to use. 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: Metal Size: Approx. 141x131x27 mm/5.55x5.16x1.06 in Adapter Power: for DC 12-38 V Voltage gain: 30dB Note: 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. Package includes: 1x Bass AMP 1x Screwdriver