Features: The FLS821 12V 40.0A SPST Automotive relays delivers sturdy 40.0A current handling with universals 4 pin compatibility, ideal for upgrading electrical systems in car, trucks, or off road vehicles. Featuring pre pigtail wire connectors and sturdy plastic housing, this relays ensures secure installations while simplifying wiring connection for easy setups. Designs for automotive enthusiasts, professional mechanics, and DIYers seek reliable power management solution for light or equipment. For high demands like off roading, towing, or customes electrical modifications requiring consistent 12V circuit control under extreme conditions. Engineered with industrial contacts and SPST switching technology, it guarantees long time performances in harsh environment while maintaining voltages stability. Specifications: Materials: Plastic Size: Switches 5.4x2.8cm/2.13x1.10inch Package Includes: 2pcs Automotive Relays note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.