H2EO Ultrasonic Diffuser. No heat, pure aromatic vapor's . Has 5 speeds, and also mode settings. This is the best Diffuser I can find, and I appreciate the technology. Use in your bedroom, child's room ( with my Wellness Blend), it helps you sleep and stay well, and also calms nervous pets. If you have nighttime sinus issues, use with my Breathease Blend. Comes with 1- 10ml Blend.