Car Stereo Amplifier 4 Channel Class AB Bass Subwoofer Booster for Auto Sound System Features： 1、High Efficiency: Power loss is significantly reduced making the amplifier highly efficient, provided with multiple protection, the amplifier have a long service time. 2、Function: The audio amplifier could provide clean, powerful music in nearly any vehicle, without changing your radio or adding a line out converter. 3、Practical: Made of hard metal material, has high hardness, not easy to break, stable output, wear resistant, with high performance and reliability. 4、Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. 5、Easy Installation: The audio player booster is easy to install, provided with user manual, quick installation according to the requirements on the manual. Specification： Item Type: Car Amplifier Material: Metal Bluetooth: 5.0 Maximum Output Power: 4Ω (watts) 45W RMSX4CH Maximum Output Power: 2Ω (watts) 60W RMSX4CH Bridge Power: 4Ω (watts) 120W RMSX2CH Frequency Response: 20Hz-20KHz (±2db) Signal to Noise Ratio: > 90dB Sensitivity: 200mV-8V Recommended Fuse Type: 40A x 1 Application: Universal fit for car sound system Package List： 1 x Power Amplifier 1 x Manual