Adjustable Subwoofer Frequency: Offers a subwoofer frequency adjustment from 20HZ-20KHZ, allowing for customized bass output Features advanced integrated feedback design and proprietary high-speed gate driver error correction for ultra-low distortion High-Quality Components: Utilizes authentic parts for and superior sound quality, ensuring a strong service life 2 Channel Power Amplifier, Connecting Multiple Speaker To An Amplifier, High-Performance Class D Power Amplifier Output impedance:4-16 type:HIFI harmonic distortion:Less than 1KHz 0.05% 4W vocal tract:2.0 frequency response:20Hz-20KHz input voltage:12V/24V wireless bluetooth:support Output power:200W The product appearance and printed words depending on the batch, but this does not affect use. Color:As Shown Material:Metal Package Contents: 1 * Audio Amplifiers 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.