1.
Used  RCA connectors ,which is made of copper-plated plug, metal shell,
and advantages of metal shell can be shielded from external
interference.

2.
Used genuine 99.9999% high purity oxygen-free copper audio signal lines
, which   specifically designed for audio equipment and music
equipment. This line have a more high toughness engineering plastics
than ohters , it can imporve the resilience and shielding properties .
It has excellent shield performance and the effection of sound is
particularly strong .      

3. External plus a network of high-density shock as protection.

4. Package : 1 Pair rca cable