The Stadler Form Ultrasonic Jasmine J-002 Aroma Diffuser offers coverage of up to 538.2 sq. ft. throughout the day. Interval mode allows operation for up to 21 hours without refilling the tank. 2 output settings allow flexibility. Interval mode provides 10 minutes of operation and then 20 minutes of rest, so your home smells delightful without being overpowering. Auto shutoff.