The modern solution to metered aerosol. ourfresh 2.0 is the perfect air freshener for any medium size space. The red LED light shows when it's time to replace the refill and battery and the preset program makes it easy to use. The smart fan does NOT run continuously but intermittently, gradually increasing the run time over the 30 days. This creates consistent fragrance. The dry fragrance releases the right amount of scent without fragrance overload or aerosol residue. Ourfresh requires one C alkaline battery which is included with each new refill. There are several mounting options, options, free-standing, double-sided tape, or screw and anchor, both of which are included with the dispenser.