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Through the construction and experiment of the set：

① Understand the sound generation and pitch, the concept and principle of ultrasonic generation.

② Preliminarily understand the ultrasonic range and its working mode.

③ Found that there is a blind spot in the detection, as long as the detection angle is exceeded, the ultrasonic It can't work normally.

④ A preliminary understanding of infrared remote control technology. 

⑤ Using ultrasound in daily life. In the process of constructing and exploration, learn to understand the working principle of ultrasound and 

echolocation and other related knowledge, so as to understand the surrounding things more objectively, let the children experience the basic 

scientific exploration process, and form a scientific attitude that respects the facts and explores the truth.