Description: RCA Audio Amplifier: 6 groups of stereo RCA signal source input interface, 6 In 1 out L/R channel audio port. Input and output frequency range: 20Hz-20KHz. Use 6 position manual switch to switch audio input. 1 output: with volume adjustment knob. Equipped with a volume adjustment switch to adjust the output volume. 6 Channel Switch Knob: Completely isolate independent circuits, ensuring that each signal not affected by other channels. None power supply: no plugging and unplugging, easy to switch. Specification: THD:90dB Material: Aluminum Alloy Product Size: 11.5cmx6cmx5.8cm/4.53inchx2.36inchx2.28inch Package Includes: 1 RCA Audio Amplifier 1 R/L Cable 1 Manual Note: Please allow slightly errors due to manual measurement and different monitors.