Nissan sentra 1600 1999 model

Question

Hi i am new to cars and this box is loose. Where does it come and what does it do? It has a few loose cables atached looks like its a positive and negative

Nissan sentra 1600 1999

Answer 1

That is a relay, could be for horn or headlights, heated rear window, fog lights, in fact anything that uses a high current.

Secure it properly.