Gold 2.5mm Female to 3.5mm Male Audio Stereo Headphone Jack Adapter Converter This is gold-plated 2.5mm Female to 3.5mm Male stereo converter 2.5 is generally used as a connector for cell phones or handsfree set for a car Most of vehicles hands free connector is 2.5 but some of vehicles connector is 3.5.3.5 is standard spec for earphone plug and usually used as basic audio socket in MP3 player, CDP or MD. Quantity: 1 PCS  Length: 33mm  Original box: NO Color: Gold Net weight: 3g Package weight: 10g Pack content: 1 x 2.5mm Female to 3.5mm Male adapter.