Use Airomist 500 Dispenser with the Airomist 6000 Refills for professional air space conditioning, odour control & fragrance enhancing. Compact, contemporary design is ideal for all restroom, washrooms & communal areas. Simple to use. 30 to 120 day service. 3 presets available. Day only or 24 hour operation. Requires 2 x D Cell Alkaline Batteries