SECOND GENERATION GLOW TECHNOLOGY - New generation Blo-N-Glo II has an LED light built into the body, eliminating the oversized top and sides of the original design. Fits all fuse boxes. GLOWS WHEN IT BLOWS - When a Blo-N-Glo fuse blows from a short or surge, a light built into the head of the fuse immediately glows to indicate which fuse needs replacing. SAVES TIME AND LABOR - With an average late model vehicle having 100 or more fuses, locating a blown fuse can be very time consuming. Blo-N-Glo fuses immediately show you which fuses are blown. REDUCES DOWNTIME - No costly downtime spent pulling and inspecting fuses to find the blown ones. No additional wasted time looking for additional blown fuses when you thought there was only one. MEETS OEM SPECIFICATIONS - High performance fuses meet exacting specifications for superior reliability. REPLACES STANDARD FUSE STYLES - Also available in ATO/ATC, ATM Mini, FMX/Jcase Fuses. For use on 12 volt Systems only. Not for use on 24 volt (or higher) Systems. Kit Contains 2 Each: 10A, 15A, 20A, 25A & 30A