XO NB121 Audio Cable is made of TPE body + Pure copper core + gold – plated plug. XO NB121 is a Universal Audio Cable For Devices With 3.5Mm Jack Sockets. It Will Allow You To Connect E.G. A Smartphone With A Car Radio Or Other Device Equipped With A 3.5Mm Jack Socket. listen to your favorite music on wearable, home or car speakers by connecting them to any playback device through a 3.5 mm jack. Now your playlists on your smartphone, tablet or audio player will surround you everywhere. XO NB121 Audio Cable is compatible with devices with 3.5mm audio port (mobile phone, Bluetooth speaker, computer and different equipment).