Brand: ARKARTECH Color: Black Ear Placement: In-Ear Headphones Type: In-Ear Noise Control: Sound Isolation Frequency Response: 40000 Hz [Hi-Res Certified] Hi-Res (High Resolution Audio) is an abbreviation for High Resolution Audio, proposed and defined by Sony, and the design standards for high-quality audio products have been established by JAS (Japan Audio Society) and CEA (Consumer Electronics Association). This device is Hi-Res certified (certification number: HRA-0118-12), and places extreme importance on reproducing the original sound, allowing you to feel a more realistic and immersive sense of presence in the music. Thank you for viewing.