Features:Easy to installNoise CancelingEliminates ground loop noise between audio source and radioCan effectively solve the problem of car audio noiseWorks with any portable device that has two 3.5mm audio jacksPower supply noise of igniter produces filtration effect， make the sound effect is betterVoltage: 12VSize: approx 6.3 x 3.8 x 3cm (L*W*H)Cable length: approx 13cmPackage Contents:1 x Car Audio Noise Filter