KZ AS16 PRO in Ear Monitor,8 BA Units on Each Side Wired Earphone with Detachable Cable HiFi IEM Earbuds,Stage Monitor Earphone HiFi Earbuds Headphone for Musician Audiophile(Black,without Mic)

Please read the provided text carefully and answer the question as truthfully as possible using only the provided context.

Do not provide any additional information or make assumptions beyond what is given in the text. What are the key features of the BL-01 earphones that will appeal to customers?