Yamaha EPH-C500 In-Ear Headphones.
The EPH-C500 In-Ear Headphones from Yamaha designed for a professional audio experience. These headphones can be used with a MP3 player, iPod, or home stereo. The headphones feature 13.6mm dynamic drivers that deliver crisp, natural audio with a frequency response of 20 to 20,000 Hz into a 16-Ohm load. The 4' cable is terminated with a 1/8" (3.5mm) gold-plated stereo mini connector and includes a 1/4" plug adapter. The headphones also come with 3 interchangeable ear buds in small, medium, and large sizes that provide comfort fit.
13.6mm dynamic drivers