Vape detection gadgets can send out both silent and audible signals

https://www.marketwatch.com/press-release/zeptive-software-update-boosts-vape-detection-performance-and-adds-new-features-free-update-for-all-customers-with-zeptive-s-custom-communications-module-b8e680c9?mod=search_headline

Vape detection devices can send both quiet and audible informs, allowing schools to choose discrete alerts or on-site deterrence methods.