Audio delay to 3.5 female mobile phone headset $ 6.29 Purpose: USB interface to headphone interface, such as some old mobile phones without 3.5mm headphone jack, only mini usb interface, you can use the secondary line to directly connect to regular 3.5mm headphones Color classification: MINI 5P male to 3.5 female black wire 0.3 m, MINI 5P male to 3.5 female white wire 0.3 m