Function: 1.Rubber sleeve battery clip, safe to use, strong attachment, not easy to fall. 2.3 different specifications of relay pins, widely used, 4-pin/5-pin switching, easy to use. 3.Humanized, simple operation, just connect the wire and TEST button to start the test. 4.LED display, clear instructions, green LED light indicates normal, red light indicates relay failure. 5.Compact size, light and portable, easy to carry and convenient to use. Condition: 100% new! Article type: Relay Tester Material: copper wire t plastic coating Color: as shown in the photo! Instructions: The tester controls the opening and closing of the relay accordingly. Tester uses 12V power supply for car batteries. Convenient automotive relay test. If the relay test is incorrect, the red LED is bright, if it is normal, the green LED is on; This product is a fast test tool for automotive relay testing and informing about the condition of automotive relays. Through continuous car battery (11 V-15 V) to relay coil, the detector can check relay contact operation properly. The detector will observe contact data, shutdown time, relay inertia at each stage of the test and so on. If all tests are successful, the green light will turn on; If the test fails, the red light will come on.