Headphone jack, phone jack, sunken headphone base, free samples, regular headphone jack are PJ307, PJ313, PJ320, PJ301, PJ322, PJ324, PJ306, PJ201, PJ202, PJ212, PJ208, PJ209, PJ327, PJ342, PJ392, PJ393, PJ321, PJ317, PJ325, PJ322, PJ301, pJ327, PJ358, PJ359. I do not know whether you have to understand about this product knowledge, then I will give you a brief introduction of several commonly used models.
