A contemporary vape detector can run on battery power

https://www.wearegreenbay.com/business/press-releases/globenewswire/9695907/zeptive-releases-update-1-33500-for-vape-detectors-adds-enhanced-detection-performance-loitering-monitoring-and-integrations-with-bosch-milestone-i-pro-and-digital-watchdog

A modern-day vape detector can operate on battery power, allowing flexible positioning in bathrooms and locker rooms without pricey wiring or remodellings.