Quality Assured & Warranty - All of our essential oil diffusers passed the strict safety and durable test, and we offer one year purchase warranty, if you got any problem with the purchased unit, please contact us, we will work out a fast resolution for you unconditionally. Easy to Use & Auto Shut-off: We simplified the function program for this 500ml essential oil difffuser, which is very easy to use with the simple button. The oil diffuser will automatically shut off when runs out of water, you do not need to worry it will be burnt out, we put your safety and health on the first!. Whisper Quiet Ultrasonic Technology: Aromatherapy Essential Oil Diffuser adopted advanced ultrasonic technology, it is extremely quiet without annoying noise that won't disturb you when you sleep or at work. No heat is used, making it safe for your kids and pets. 4 Adjustable Mist Timer : 500ml Essential oil diffuser has a large water capacity, which can run last for 10-15 hours, you also can set the different timer to run: Continous Mist, one hour, three hours and six hours; The diffuser will turn off automatically when runs up to the mist timer setting, you do not need to worry it burn out. Unique Design & Durable Material: Arvidsson 500ml essential oil diffuser is made of 100% iron metal shell and PP material water tank, BPA free, which has more unique & attractive handmade vintage metal shell style to decorate your home, not only a diffuser.