Air Freshener Dispenser Delivers Improved Aesthetics, Performance And Battery Cost Savings To Your Facility While Providing More Flexibility And Control Over Your Air-Care Dispensing. Simplified User Interface Allows You To Customize The Dispensing Minute Intervals: 7.5, 15 Or 30 Minutes. Light Sensor Allows Flexible Programing When Needed So You Can Choose From The Following Settings: Light, Dark Or Both. Removable Magnetic Lock Requires You To Open The Unit With The Included Magnetic Key To Prevent Unauthorized Access To The Fragrance Canister. Battery-Operated Construction Requires Two Aa Batteries For Up To A Year Of Performance, Or Accepts Four Aa Batteries To Provide Up To Two Years Of Performance. Dispenser Is Designed For Use With Compatible Timemist Metered Air Fresheners (Sold Separately).