Usually used to extend a speaker or headphone cable (which uses 3.5mm jacks).
3.5mm Jack (headphone jack) to 3.5mm socket - coiled extension Nickel plated connectors. 2 metres long coil
Please be aware that the coiled cable length is the amount of cable used to make the coil. The cable will not be able to extend to this full length due to the coil. We usually find that coiled cables extend to a usable 50-75% of the length specified.