New Lower Price! It’s portable & wireless w/ rechargeable battery, operated by motion activation or timer settings. A patented technology! The Airburst is a small, powerful diffuser operating without water with 2 mist modes. Run on the timer mode (every 5 minutes) or motion-activated mode designed to hibernate until it detects the presence of movement. Its infrared motion sensor has a 13-foot range, a 120-degree field of view, and stands inconspicuously ready to release your favorite oil or blend into the air whenever someone enters the room. This economical diffuser runs for weeks on a full charge and recharges in less than 5 hours. Made from recycled plastic. Bottle and Cap sizes that fit the ‘AIRBURST’ are: 18 mm Euro Style, though bottle volumes over 15 ml…the white top cap must be left off the unit; that is no operational problem and it will still will look good!