MDR stands for the dynamic earphone of Sony earphone products, and XBA stands for the earphone that drives the coil iron unit. \x0d\ and EX generally refer to in-ear type, such as EX5 10, EX 1000, e stands for flat type, such as E092 1, E 19, XB stands for subwoofer, such as XB920, and ZX stands for monitor headphones, such as ZX. For example, EX0365438\x0d\\x0d\ and some products without prefixes, such as 1R 10R, etc.