For B2B buyers, the primary technical focus should be on sound quality and recording duration. Standard models typically offer 10 to 30 seconds of recording time, but for educational or complex training purposes, look for chips supporting up to 60 seconds. Ensure the speaker output is at least 80dB for clarity in noisy environments. For pet training (AAC), the button must feature a low-profile design and non-slip rubber feet to prevent sliding. For promotional gifts, prioritize customizable top-shell colors and high-quality silk-screen printing for brand logos.