Prevents Unwanted Hum. 3.5mm Jack Plug to 3.5mm Jack Socket. 60mm Cable LengthInput Connection: 3.5mm Jack Plug Output Connection: 3.5mm Jack Socket Dimensions: 60 x 35mm Weight: 130g. A 3.5mm jack ground loop isolator designed to reduce humming between two pieces of audio equipment that have a ground loop issue. The cable is 600mm in length and is small enough to take anywhere when out gigging. Also suitable for home use when practising or for studio applications.. 3.5mm Loop Isolator