This part is multifunctional: it allows you to connect the charger and jack plug to your iPhone SE, connect to the network and hear during calls. If any of these functions are not working properly, this is the part you need to replace.
This part connects the jack socket, Lightning connector, call microphone and network to the iPhone SE's motherboard. If you experience the following symptoms, it needs to be replaced:
The inside of the connectors is black, originally fitted on a black iPhone SE but can be easily installed on a white one.