Four foot length permits easy viewing of fuel injector voltage signal from almost anywhere on the vehicle. Used with OTC Nos. 7187, 7188, 7601, 7602, 7608, 7828 and 6023, as well as other brands of Noid lights. Suction cup at end of extension cable permits placement on hood, fender, windshield, etc. without damage to surface. Weight: 5 oz. A Noid lite is inserted into cup end of extension table, then plugged into vehicle's injector wiring harness. Fiber optic cable is routed out of engine compartment with end placed where it can be observed. Engine is cranked, and flashing at end of extension indicates normal injector pulling voltage.