Note: 1. Used only do car battery 12 V. 2. The voltage range during testing is 11 V-15 V. Function: 1. Battery clip with rubber sleeve, safe to use, strong attachment, not easy do 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 cable and the TEST button to start the test. 4. LED display, clear instructions, green light LED indicates normal, red light indicates relay failure. 5. Compact size, lightweight and portable, easy do carry and convenient to use. Specification: Item Type: Tester Relays Material: copper wire plastic coating Color: as shown in the picture! Instructions: Tester controls the opening and closing of the relay accordingly. Tester uses a 12V do car batteries. Convenient test of car relays. If the relay's test is incorrect, the red LED is bright, if it is normal, the green LED is lit; This product is a quick do testing car relays and informing about the status of car relays. Through a continuous car battery (11 V-15 V) do of the relay coil, the detector can correctly check the operation of the relay contact. The detector will observe the contact data, closing time, relay inertia at each stage of the test and so on. If all tests are successful, the green light will come on; if the test fails, the red light will light up. List of packages: 1 x tester relays