Airnergy AZ550 Automatic Air Freshener Dispenser Airnergy Auto Air Freshener Dispenser Set include a Dispenser, 1 unit of full size 300ml Refill and 2 units of AA alkaline batteries. Airnergy 3,000 Metered Spray is an Aerosol air freshener specially formulated from PREMIUM QUALITY fragrance to neutralise odours in larger areas with multi-layered scent. Suitable to use in office hall, lobby, hospital, washroom, reception room and trafficked area with antibacterial properties. Up To 60 Days Supply Based on 30 minutes spray interval.