耳機線上有”Designed by Apple in California Assembled in China,後面還有串號“耳機上有”L”和“R”的字母,也就是左右之分,耳機音量調節處有“+”和“-”。
例如,蘋果6的耳機線上有標識的,每個蘋果耳機的線上都會有的,在蘋果6耳機靠近插口的線上面字母寫著:Designed by Apple in California 等信息。