Welcome to our store attractivefinesuper.th.Wish you have a good shopping. Product Description CNBJ-707 is a fast test tool to test automotive relays, so that you know the status of automotive relays. Through the continuous automobile battery (11V-15V) to the relay coil, the detector can properly check the relay contact function. The tester observes contact data, closure time, relay inertia at each test stage, etc. If the test is qualified, the green light will be on, and if the test is not qualified, the red light will be on. Features: This tester is designed to test the condition of your car relay. Test to properly control the opening and closing of the relay. If the relay is abnormal the red LED will light, it's normal the green LED will light. Provides a convenient and intuitive diagnostic way, time-saving and economical. Small size, compact structure, easy to carry, you can test anywhere as you want. Note: Car battery must be 12V battery, the voltage must be between 11-15V. The coil resistance is preferably at least 20 ohms Specification: Voltage: 12V Material: Plastic & Metal Color: Black & Red Item Size: 12 * 6 * 2.5cm / 4.72 * 2.36 * 0.98in Package List:1 * Relay Tester