Its a fuse, not much to say. It works like its supposed to
2 Pack of 150 Amp Nickel-Plated ANL Fuse (Belva BANL150)
Two fuses per order. High quality 150 Amp ANL Fuses
For fuses, this is the type of fuse.
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Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.