Dear customers, We are always working hard to ensure that orders are delivered on time. But inevitably there will be a very small number of orders may be delayed due to the worsening of the epidemic. Thank you for your support! 8 800W Car Subwoofer Speaker 12V Power Amplifier bluetooth Audio Music Player. Product Name: Car Subwoofer. Voltage: DC 12 V. High level input sensitivity: 1V. Low level input sensitivity: 300mV. Low pass filter: 50 hz-150 Hz. Bass boost: 0to + 12dB. High pass wave generator: 20Hz. Dimension: 35cm x 26cm x 7cm (L X W XH). The external configuration of high strength stainless steel horn protection net cover. Alloy fuselage to reduce the noise caused by the vibration. 8 inch 800W high power design, with the volume controller. Low frequency ability of the bass horn, high quality low tone output. Fine workmanship and good performance. Easy to install, can be installed directly under the driver’s seat. We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. Please allow 0.5-1 inch difference due to manual measurement. The instruction is not included in the package. Professional installation is Highly Recommended. 1 x 4m Positive power cord (red). 1 x 0.4m Negative cable (black). 1 x 4m Audio cable (blue). 1 x 4m Control cable (dark blue). 1 x User manual. If item is defective after 3 months, you can still send it back to us.