The GP PRO ActiveAire deodorizer refill works with The GP PRO ActiveAire freshener dispenser to automatically stop odor in the stall and enhance the restroom experience for all. Mounted atop the Compact® Side-By-Side Bath Tissue Dispenser, this state-of-the art odor management system uses motion-sensing technology to automatically neutralize odor while releasing a burst of freshness upon entering and leaving the stall and it's on-demand feature can be activated with the wave of a hand if a visitor needs a little extra burst of freshness.