Car Auto Relay 4 Pin SPST Alarm Relay Automotive Van Boat Bike 12V DC 40A 40 AMPFeatures Durable SPST contact type 12V DC rated voltage It is used when a device draws heavy amperage such as car alarms remote starts HID headlights pop doors trunk releases strobe lights fog lights stereos fans air horns and much more Specification Colour BlackVoltage 12VCurrent 40AContact Type SPSTMaterial Metal PlasticPin Number 4 PinNote Instruction is not included Please check the size measurement chart carefully before making payment Please allow 0 5 1 inch difference due to manual measurement 1 inch 2 54cm The color of the actual items may slightly different from the listing images due to different computer screen thanks for your understanding Package Included 1 X Car Relay