Features 1、The tester is designed to test the condition of automotive relays. 2、Test to properly control the opening and closing of the relay. 3、If the relay is abnormal, the red LED will be on, this is normal, and the green LED will be on. 4、Provide convenient and intuitive diagnosis, saving time and economy. 5、Small size, compact structure, easy to carry, you can test anywhere. Specification 12V electric vehicle relay tester battery diagnostic tool bayonet pin relay detector. The CNBJ-707 is a quick test tool for testing automotive relays so you can see the status of your car's relays. By connecting the car's continuous battery (11V-15V) to the relay coil, the detector can correctly check the contact function of the relay. The tester will observe the contact data, closure time, relay inertia, etc. for each test phase. If the test passes, the green light is on; if the test fails, the red light is on. Features: The tester is designed to test the condition of automotive relays. Test to properly control the opening and closing of the relay. If the relay is abnormal, the red LED will be on, this is normal, and the green LED will be on. Provide convenient and intuitive diagnosis, saving time and economy. Small size, compact structure, easy to carry, you can test anywhere. Note: The car battery must be a 12V battery and the voltage must be between 11-15V. The coil resistance is preferably at least 20 ohms. Specifications: Material: ABS Item Size: 12 * 6 * 2.5 cm / 4.72 * 2.36 * 0.98 inch Package Size: 15 * 8 * 5 cm / 5.91 * 3.15 * 1.97 inch Package Weight: 200g / 7.05oz Package List: 1 * Automobile Relay Detector 1 * Battery Clamp 1 * User Manual (English) Package List 1 * Automobile Relay Detector 1 * Battery Clamp 1 * User Manual (English)