The 3.5-ILNO is designed to connect between any 3.5mm headset jack type audio connector hence, eliminating any RF (Radio Frequency) noise that may be present. It will connect in line with a 3.5mm audio cable. This part has a female 3.5mm headset jack on one end and a male 3.5mm headset plug on the other. The female 3.5mm headset jack as well as the 3.5mm male headset plug can serve as an input or output. There is no specific direction when connecting this part.