NWOT KZ Castor In-Ear Monitor (IEM) headphones. These IEMs feature an innovative dual-dynamic driver acoustic design, with a top and bottom stacked cavity structure for enhanced sound vibration. The KZ Castor allows for sound customization with built-in professional-grade filters, offering 16 different audio profiles through adjustable low-frequency and high-frequency settings. Harman Target Versions: They are available in both a standard Harman Target version and an improved bass version, catering to different audio preferences. They come with noise-isolating silicone eartips designed to effectively block external sound and provide a comfortable fit. #e1