The model predicts binary masks that states the presence or not of the object of interest given an image.
The model predicts much better results if input 2D points and/or input bounding boxes are provided
You can prompt multiple points for the same image, and predict a single mask. 
Fine-tuning the model is not supported yet
According to the paper, textual input should be also supported. However, at this time of writing this seems to be not supported according to the official repository.