Features: Isolate and eliminate noise caused by a ground loop in an audio circuit with this Four-Channel Ground Loop Isolator. The isolator ensures that the shield ground on each audio cable is isolated from any equipment ground, which could cause audible noise when amplified. This device has four channels, composed of two pairs of stereo (L+R) inputs and outputs. The nominal for DC impedance of the device is 100 ohms and the audio impedance is 3500 ohms at 1000 Hz. The nominal input power is 50 , with a maximum power level of 100 . Specification: type: Noise Sound Eliminator Connectors: 4x RCA male, 4x RCA female Rated input: 50W input: 100W What it does: Eliminates ground loop and between the audio source and the amplifier. placed between the head unit and the amp or EQ Material: Plastic+copper core colour: Blue+transparent Package Contents: 1 x Noise Sound Eliminator 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.