iFI audio iDefender MAX +CC Hum Noise Reduction Accessory [Domestic Genuine Product] USB-C -> USB-C (CC) Used for a few months at home, but selling due to a change in environment. Body only. Product Description Eradicate Buzz Noise Are you troubled by hum or buzz noise? Using multiple earth/ground terminals within an audio chain means that the earth/ground points are separated. These multiple earth/ground points cause ground loop problems. This leads to unwanted noise, buzz, and distortion. The iDefender+ provides a simple and effective solution. Breaking the Loop When you connect the iDefender+ to the USB port of a source device such as a PC, the iDefender+ detects whether there is a ground loop problem. By "intelligently" disconnecting the ground of the source device, it blocks the ground loop, eradicating hum/buzz noise, as well as lowering the noise floor of the system and improving resolution and dynamic contrast. If the source device and the device connected to the iDefender+ are self-powered, the iDefender+ will work simply by being placed in between. In the case of bus-powered operation, it works by supplying power from the USB-C port on the side. Also effective for bus-powered USB-DACs Are you using a USB-DAC that operates on USB bus power, rather than being powered by an external power supply or a built-in battery? In that case, supply power from the USB-C port on the side of the iDefender+. It blocks the power/ground from the source device and instead supplies "clean" power from the USB-C port to the USB-DAC. Using a high-quality, low-noise power adapter such as the iFi iPower 5V will significantly improve the performance of the USB-DAC.