(1) Power supply:switching power supply (2) Watts:4 ohms/200w,8 ohms/100w (3) With automatic standby function (4) Amplifier Amplification Mode:Analog (5) Frequency range:30-150HZ Tip:This subwoofer amplifier board is a real pure bass amplifier with only strong bass output. Power tube:5198/1941 Speaker wiring mode:The red wire is connected to the positive pole of the speaker. The black wire is connected to the negative pole of the speaker. Colour:Black Material:ABS Size:External dimensions:200 mm x 145 mm x 53 mm thick; Opening size:177mm x 125mm x 55mm Package Contents: 1 * car audio 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.