A modern-day vape detector can operate on battery power

https://www.kxan.com/business/press-releases/globenewswire/9676076/zeptive-software-update-boosts-vape-detection-performance-and-adds-new-features-free-update-for-all-customers-with-zeptives-custom-communications-module

A modern-day vape detector can operate on battery power, making it possible for flexible placement in restrooms and locker rooms without costly circuitry or restorations.