2. Electric fan with timer: It consists of timer and electric fan.

3. Refrigerator with temperature display: It consists of refrigerator and temperature display.

Invention:

Invention is the process and achievement of using natural laws to solve unique problems in the technical field and put forward innovative schemes and measures.

In order to meet the needs of people's daily life, the invention provides an unprecedented model of artificial natural objects, new processes and methods for processing and manufacturing, as well as innovations and transformations of mechanical equipment, instruments and various consumer goods, related manufacturing processes, production processes and detection control methods.