Features:Health test for 4 and 5 pin electro-mechanical relays commonly found on modern vehicles Test feature will cycle the relay ten times, testing the resistance, contacts and consistency within each cycle If a cycle fails on the test then this will be indicated by a red LED and alternatively a green LED if relay works Specifications:Model No: TA131Relay Configurations: 4, 5 PinHeight: 182Width: 128Length: 69, Weight: 0.7275254646 pounds, Manufacturer: Sealey