"Bass booster" that conveys the deep bass groove feeling. This is not wireless earphone. Bass Boost: Sony's Powered Bass Duct++ technology provides you with deep receptive bass and powerful sub-bass, which makes it great for genres of music that are low-end focused styles.
These have always been my favorite and preferred earbuds for sound quality. I usually have to buy a new pair every 3 to 4 years because I wear them 10 hours per day. I tried quite a few other brands that claim to have a deep rich bass sound, but nothing else has come close to this brand.