Pwave Door Fresh Drone Unit. The ‘Drone’ is an air freshener holder that goes in each of the stalls on the door. The unique design releases the fragrance, each time the doors open and closes. The Directa Door Fresh is the intelligent air freshener with a fragrance that lasts for over 30 days.For our full range of Pwave products, click here. Need product advice? Give us a call on 01621 828882 and our sales team will be happy to help.