Adopting top for red ring output inductance, no output consumption, more pure sound voice. Adopts MKP10 as output, more rich overtone. Adopts high speed capacitor array. Lower internal resistor, dynamic more violent. Voltage DC12V-25V Notes: The correct using sequence is first connect laptop power with amp power port, then charge the laptop. Do not use cheap audio signal cables, these cables are without shieldiing, they will lead in high frequency noises. The bigger the rotation, the larger the noises. Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:As Shown Material:Plastic Package Contents: 1 * Home High Power Amplifier Board 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.