The Koss KEB15iB Blue Earbuds combine ergonomic design with effective noise isolation for in-ear use. They come with three sizes of cushions to accommodate different ear shapes, ensuring user comfort and a secure fit. The earbuds include a straight dual-entry 4ft cable with a 3.5 mm plug for versatile connectivity. With a frequency response range of 18-20,000 Hz and impedance of 16 Ohms, these earbuds are designed to deliver clear and reliable audio output.