Shout, Scream, A Shout, A Scream
noun
叫ぶ is "to shout" and "to scream." This is the noun version. This is a shout or scream.
さけび
The reading comes from 叫ぶ.
この人形に単四電池を入れて電源を入れると、叫び出すんです。
If you put triple A batteries in this toy and turn on the power, he will scream.