Quantity: one set Color: Red Material: The car battery tester is made of high quality materials. Made of plastic and metal, sturdy and practical, fine workmanship, good performance and durable. Quick test tool: adjustable for two-way relays. 4 and 5 pins, with a continuous car battery (11V-15V) at the same time. Through the relay coil, the detector can correctly check the contact function of the relay. Portable size: 12 x 6 x 2.5cm / 4.7 x 2.4 x 1.0inch, small size and compact structure, easy to use. Carry and transport. You can test wherever you want. Function: Designed to test the status of automotive relays. When the tester lights green, it means that the relay is normal, and when it lights red, it means that it is abnormal. Wide range of applications: The tester observes contact data, closing time, relay inertia, etc. at each test step. The quick and easy automotive relay test provides a convenient and intuitive way to diagnose. Tip: The green light on the tester indicates that