With the RHA MA750i you can play Hi-res audio files. These files are larger than the standard mp3 format and contain more detail. In addition, the earbuds have a frequency range of 16 to 40,000 Hertz. This allows you to hear all the details from your favorite music. With the control in the cable you take phone calls and control the music. This way you can easily switch to the next number while leaving your smartphone in your pocket. You wear the earplugs by placing the cord over your earcup. This way they stay firmly in place. The copy is made of stainless steel and has a gold-plated connector for a trouble-free connection.