RCA male and female head noise filterIsolates and eliminates noise caused by ground in audio circuits with -channel ground loop isolators.Isolators that the shield ground on each audio cable is isolated from any equipment ground that could cause audible noise when amplified.Passive in-line device.Eliminate ground loop humming and buzzing noise between an audio source and an amplifier.When used with car audio, this isolation circuit goes between the head unit and the amp or EQ.type: Audio filterMaterial: Plastic+copper corecolour: blackPackage Contents:1 x audio filterOnly 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.