A particulate air filter is a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air.

The third technological development was the double lumen breast-implant, a double-cavity device composed of a silicone-implant within a saline-implant.

A beer bong is a device composed of a funnel attached to a tube used to facilitate the rapid consumption of fluid.

A time bomb is an explosive device composed of a power source, detonator, explosive charge, and a timer which substitutes for a fuse or trigger.

A transcriptor is a transistor-like device composed of DNA and RNA rather than a semiconducting material such as silicon.

One example would be looking for implanted medical devices composed of nonoxidized cellulose.

OLEDs are solid-state devices composed of thin films of organic molecules that create light with the application of electricity.

Calculating devices composed of tubes filled with bright liquids.

A ring oscillator is a device composed of an odd number of NOT gates whose output oscillates between two voltage levels, representing true and false.

An infoscope is a handheld device composed of a digital camera and wireless internet access.