Features:This audio amplifier is used for car CD VCD DVD player without low frequency RCA output.High-frequency speaker output will be converted to low-frequency RCA output, connect the car amplifier subwoofer signal input.Compact design for easy plug & play installation.For CD machine without RCA output seat to add a subwoofer and use this high to low speakers to receive the subwoofer input.Wiring diagram is attached on the back of the package, convenient to install.Specifications:Condition: 100% Brand NewMaterial: Plastic, Electric ComponentsColor: transparentSize(L W H): 5.5 3.7 2.5cm / 2.2 1.5 1.0inPackage Weight: approx.46gPackage List:1 * Audio CD Amplifier