It's a little tripod that can fit in your hand that fits any phone. It can be used to add more details to a scene, for exemple, placing the model on the desk of your character to say that they are an amateur photographer.
The model comes with three boxes: The one called phonestand is used to move the entire tripod, the one called phonestand_lower_half is used to move the body and legs of the tripod, the one called phonestand_upper_half is used to move the head of the tripod. The arrow that points up is used to move up and down to phone holder.