Smartglow, 2 Pack, 20A, Big ATO Blade Automotive Fuse, Glows When It Blows Day Or Night When A Fuse Blows, Indicates Immediately When A Fuse Needs Replacing, Saving Time To Troubleshoot An Open Circuit Hard To Find Blown Fuses In Dimly-Lit Dashboards Are Easier To Identify, Giving Fleet Maintenance Departments The Ability To Quickly Return Vehicles To Operation Designed To Be Direct Replacements For Existing Automobile Applications.