Aluminum and stainless steel hybrid housing. Tuning for tight bass This model emphasizes bass, but is easy to hear the contours of the sound. Earphones with tuning optimized for musical instrument characteristics. High resolution cover and microphone are equipped with a microphone. It can also be used for online lessons and GIGA school needs; Unlike Bluetooth completely wireless even on online, there is no sound delay; Madein Japan; Gentle on childrens ears; Comes with memory foam eartips that wont hurt your ears even after long periods of use.