Features: Made from high-quality matter, compact, and .Round recessed anel with gold lated spring-loaded terminals. Gold-plated contacts for optimal signal transfer.Spring clip will s wire up to 4mm/ 0.16in. Rear terminals are standard 0.25 "female swords connector or welded joints. Positive () and negative (Black) indicators to correct wiring.Easy to install, just cut the holes and ush it. Rear connections use quick disconnect connectors.Screw Terminal Round Cup Connector only, other accessories demo in the icture are not included!