This tester is designed to test the condition of your car relay to properly control the opening and closing of the relay.If the relay is abnormal, the red LED will light, and it"s normal, the green LED will light.Car relay tester provides a convenient and intuitive diagnostic way, which is time-saving and economical.Auto diagnostic repair tool is portable, small and compact structure, you can test anywhere as you want.Car battery must be 12V battery, the voltage must be between 11-15V, the coil resistance is preferably at least 20 ohms.Specification:Material: PlasticandMetal.Color: Black Red.Size: 13x7x3cmVoltage: 12V.Note:There might be a bit color distortions due to different computer resolutions.There might be a slight errors due to different hand measurement.Package Included:1 x Car Relay Tester.Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it