5 Pack AGU 20 AMP Indicating FuseDesigned specifically for 12 volt car audio systems,.Allows you to visualize when there is an open circuit with-in specific lines.When the circuit is closed the indicator will NOT illuminate.This will give you the advantage on diagnosing which circuit is having the problem.Description: Five (5) Pieces Pack Series: AGU with LED status indicator Style: Glass Fuses Voltage Rating: 32 Volt Current Rating: 20 Amp Gold Plated Connections Overall Fuse Length: 1.5″ Overall Fuse Diameter: 0.43″MFGAGU-20