This 24 Hour Mechanical Timer is hardly noticed and perfect for aromatherapy diffusers. It is a programmable daily-cycle timer with up to 48 On/Off settings. The Aroma-Timer will work with all Diffuser World products that use a US electrical outlet such as the Aroma-Ace, Aroma-Breeze, Aroma-Pro, and the Aroma-Whisper. Set it before you go to sleep and the timer will shut the diffuser off for when you want it to stop. No more wasting oils by having your diffuser run all night. You can also set the aroma diffuser timer so that you can wake up to your favorite essential oil every morning.