About 3.5mm Stereo Plug to 3.5mm Stereo Plug 0.5m:

This product is a 0.5m 3.5mm Stereo Plug Lead, designed for audio signal connection. If you need to connect a mobile device, personal audio player, or an audio device with an aux input then you’ll want to add one of these to your basket. Also available as a 1.5m length lead. Technical Specifications include

• Cable Diameter: 3.5 mm Ø