Usage Tips:Specification:brand Colour: BlackVoltage: 12VCurrent: 40AContact Type: SPSTMaterial: Metal, PlasticPin Number: 4 PinNote:The Contacts on this relay is normally open (NO)Features:- Brand - SPST contact type- Durable- 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.Note:1. Please check the size measurement chart carefully before making payment.2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)3. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.4. Instruction is not included.Package included:1 x Car Relay with Socket