Used with Nilotron Metered Air Fresheners, this dispenser provides continuous 24 hour air freshening. Adjustable level of fragrance. This Dispenser allows you to control the level of fragrance with a 7, 15 or 30 minute setting. This dispenser also has an anti-theft lock out key, On-Off switch, empty can indicator light and a test button to check for correct refill/battery installation. (Batteries not included).