R2-D2 Devices and tools used in Star Wars

Data Slot. Used to store messages or data.

Tool arm. Used to open doors or press buttons. R2-D2 used this to access the door control to the escape pod. Usually escape pods are only for human and alien passengers but R2-D2 had been given access controls given to him by princess Leia to carry out his secret mission.

Computer Link arm. Used to access computer terminals.

Fire Extinguisher. A gas bassed fire extinguisher effective against electrical fires and can be also supplemented as a smoke screen to cause confusion during battles.

Common feature on astromechs. Displays technical information and also used for sending messages.