*Automatic Sensor Air Freshenser Dispenser:fragrance dispenser brings you the fragrant air automatic by timer. You can set the fragrance frequence from 7.5, 15.30 minutes interval spray time and working mode can chosen at your preferring fragrance level; working mode can be easily set to your desired fragrance delivery frequency chosen from 24H/DAY/NIGHT. .Detailed set guideline referring to the instruction on the package. *Battery Operated Sensor Dispenser:airfreshener automatic sprayer requires 2 pcs AA batteries (NOT INCLUDED) to operate to bring continuous and long-lasting fragrance into your bedroom, guestroom, beauty center, gym and so on. LOW BATTERY: when battery power lower than 2.3V, the perfume dispenser stops working *Fit Air Freshenser Can: automatic perfume dispenser matches international standard size air freshener refill can(10fl.oz/300ml), 5.51"(H) x 2.56"(D), namely Glade,air freshener can(Not Included). *Wall Mounted/Free Standing :this bathroom fragrance dispenser can be mounted to wall, 7-9 feet above the floor; or you can just put it standing on your bedroom desk, office table.Due to the recent product grinding tool upgrade, you may receive the new and old shell products, but all other functions of the machine are the same, only there are two crescent bends after the upgrade of the product shell, as shown in the fourth picture, after the upgrade, the product operation is more user-friendly.