BlueStone Essentials diffusers are perfect for any environment. With ultrasonic technology, our diffusers are quieter than most, conserve and protect fragile essential oil components, and disperse very fine therapeutic particles that are easier for the lungs to absorb. They are ideal to diffuse your favorite oils in the home, car, RV, children’s bedroom or at the office. Our smaller (Ultrasonic Diffuser, small 140 ml) and car diffusers are perfect to pack in an overnight bag or suitcase, use on trips, and in your hotel room.