iFi audio USB Noise Reduction Accessory iDefender3.0 for sale. This is an accessory designed to physically block ground loop noise, such as "humming" or "buzzing," and unwanted noise that tends to occur in USB-connected DACs, audio equipment, and PC audio environments, and that enters via the USB port. With a structure that separates the USB signal line and power line, it suppresses sound blurring and noise, and allows you to aim for a clearer and more stable playback environment. This is a particularly good item for those who use PC audio or USB DACs and are considering noise countermeasures or sound quality improvements. It supports the USB 3.0 standard (USB 2.0 backward compatible) and, despite its compact size, is well-made, making it ideal for those who want to easily implement noise countermeasures. It worked without any problems when I actually used it, and I am selling it now to organize my equipment. 【Product Condition】 ◎Appearance: There are very minor scratches from use, but there are no noticeable scratches or damage, and it is in good condition overall. You may feel a slight stickiness. ◎Operation: The ground loop isolation and noise reduction function during USB connection worked without any problems. *The effect varies depending on the usage environment and connected equipment. ◎Storage: Indoor storage except when in use Non-smoking, no-pet environment *This is a confirmation based on personal use, not inspection by a specialist. 【Included Items】 ・iDefender3.0 main unit *Everything in the photos 【Additional Information/Notes】 ◎Please refrain from purchasing if you are extremely sensitive to the condition as this is a used item. ◎We do not guarantee the removal of all noise. ◎The effect varies depending on the usage environment and connected equipment. ◎Returns are not accepted to prevent product substitution. ◎We will pack it carefully and ship it using a trackable method. ◎Instant purchase is OK. ◎Price negotiations are welcome (within reasonable limits).