Smartglow, 5 Pack, Big ATO Blade Fuse, Assorted, Contains 1 Each Of The Following: 10A, 15A, 20A, 25A, 30A, 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.