Sleep in total silence. No need to tolerate hums and whistles. The peaceful sleeping atmosphere for you.and safely every night thanks to the auto-shut off feature and nearly silent operation. Extra large essential oil diffuser multifunctional aromatherapy device: This essential oil diffuser is an amazing aromatherapy device unlike any other you've ever used. High mist output large humidifier made with premium quality materials: Besides its uses in aromatherapy, this essential oil diffuser also functions as a humidifier. Use it to improve your home's air and atmosphere quality, cover the smell of pets or smoking, and protect you family from excessively dry air! humidifiers, this has an extra-large capacity and can run all night. It can hold up to 1000 ml of water and can run up to in low mist with one fill.