Check the listing for details. (8 NEW) SPC 300-B Two Conductor Phone Plug. Condition: New. Listed at 14.99 USD. The SPC 300-B Two Conductor Phone Plug is a high-quality product designed for use in phone systems. With SPC Technology as the brand behind it, you can trust in the reliability and durability of this phone plug. This specific model features two conductors and is ideal for businesses and industries that require accurate testing and measurement of phone systems. Its innovative design and user-friendly functionality make it a valuable tool for ensuring optimal performance in phone communication systems.