Wesbar 7-Way Blade to 4-Flat with LED Circuit Tester Features Easily Adapt OEM 7-way blade connector to either 5-flat or a 4-flat connector. Instantly checks electrical circuit for connectivity. Displays connectivity using high visibility Blue LEDs. Attached dust cover included to keep terminals clean when not towing a trailer. California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Trailer Electrical Lighting Wiser Yes Bulb Type LED Prod