* Simile: The primary technique is a simile, comparing the speaker's voice to that of a kindergarten teacher using the words "like." This comparison is meant to evoke specific connotations about the speaker's voice, such as being high-pitched, sweet, and potentially a bit childish.
* Metaphor: While not explicitly stated, there is a metaphor present. The sentence suggests that the speaker's voice is not literally made of ice cream, but that it possesses a similar quality. The word "ice cream" itself can be interpreted as a metaphor for something sweet, cold, and potentially artificial.
* Imagery: The phrase "ice-cream voice" creates vivid imagery in the reader's mind. It evokes a sense of sweetness, coldness, and potentially a lack of substance, suggesting a voice that is not deep or resonant.
* Personification: While not a primary technique, the sentence also personifies the voice by giving it a quality (being "like a kindergarten teacher"). This helps the reader visualize the speaker's voice as a distinct entity.
Overall, the sentence effectively uses literary techniques to create a vivid and memorable image of the speaker's voice, allowing the reader to quickly understand its perceived qualities without explicit description.