All models have chemical-resistant plastic construction, a red usage-indicator light for 3,000 actuated sprays, a keyless “press and release” button for convenient refill, a can-out reminder and an alkaline battery life of 1 year (spraying at 15 minute intervals 24 hours/day, 365 days/year). They are formulated for use in hotels, hospitals, offices, motels, nursing homes, restaurants, schools and public buildings.