When selecting sound buttons, you must prioritize audio clarity and battery longevity. Ensure the speaker output is at least 0.5W to 1W for crisp sound. For the recording mechanism, look for high-quality IC chips that support durations from 10 to 60 seconds or more. The trigger mechanism should be rated for at least 5,000 to 10,000 presses to ensure durability. Additionally, verify if the product uses replaceable AAA or button cell batteries, as this significantly impacts the product's lifecycle and consumer appeal.