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Pliers.
The rumble device is designed to - encourage you to reduce your speed - alert you of a hazard approaching
A guard is a device designed to prevent injury from rotating machinery.
a pulley because it could carry heavy stuff
That would depend on what yu device it. If it is a computer related device then a virus or malware.
A computer is defined as an electronic device that is designed to accept data.
An ergonomic device is a device that is "designed for the safe and comfortable interaction between human beings and machines."
cpu
device drivers
A device that was designed to tabulate polynomial functions
cars
Genaraly a device is a machine designed for a purpose.