P-Wave Easy Fresh Fan Cover 30-day Air freshener for P-Wave Easy Fresh Fan Air Freshener Dispenser, {Ocean Mist}Looking for an air freshener containing twice as much fragrance as most other air fresheners which is released over 30 days? Easy to use, simply replace the old cover with a fresh one - it's easy!No aerosol, just a fragrant cover which lasts 30 days. No keys or tools required. Magic eye setting turns fan off when the lights go off allowing battery to last up to 4 months.Intelligent fan is programmed to increase the amount of time it works in order to give a consistent amount of fragrance over 30 days.LED reminder when the cover needs changing. .. P-Wave Easy Fresh Fan Cover Ocean Mist - PACK (12) Note: Image is for illustrative purposes only and may differ from the actual product.