1Applicable Models: This car relay diagnostic tool is suitable for testing both 12V and 24V relays, whether they have four or five pins. It offers versatility in diagnosing and evaluating the functionality of these relays. 2High Definition LED display: The automotive relay tester features an upgraded LED screen that provides a clear display even in dimly lit environments, ensuring easy operation at a glance. 3High Brightness Lamp: The tester is equipped with a bright illumination lamp, allowing for convenient testing even in the dark. With just one click, the illumination lamp can be activated, eliminating any concerns about working in low light conditions. 4Efficient and Reliable: The primary function of this tester is to determine the normal functioning of automotive relays. Through quick display analysis, it enables users to distinguish between good and faulty 12V and 24V relays. This feature saves time and improves diagnostic efficiency. 5Large Capacity Battery: The relay detector is equipped with two high capacity batteries, ensuring long lasting durability. Additionally, a charger is included, enabling convenient charging and unlimited usage.