Features: Made of fine quality material, solid and practical. Inform you of the condition of the car relay. Observes the pin configuration, the time to contacts closure and opening, the consistency of the relay. Compact, lightweight and portable, it is easy to carry and use. It works accurately and efficiently, and is the perfect choice for you.Specifications: Color: Black Material: plastic + metal Line length: 90cm Item size: 13 * 6.8cm Package size: 18.5 * 9.3 * 5.7cm Package weight: 228gNote: 1.The car battery must be a 12V battery and the voltage must be between 11-15V. 2.The coil resistance should preferably be above 20 ohms. 3.If the relay test is abnormal, light red LED. If normal, light green LED.Package List: 1 * Relay Tester 1 * Instruction Manual