Used for approximately 3 years. There are signs of installation, but it works without any problems. Different amperage versions are also listed. Ships via Nekopos (domestic delivery service). ＜Product Description＞ Super conductive premium rhodium coating + processed auto fuse Compatible with Mini-sized fuses For car audio use only. Do not use for other purposes. For amplifier-integrated head units, center units, navigation systems, external amplifiers, etc.