dōTERRA Pilot Ultrasonic Diffuser, model BY-PD01.  It is a portable and rechargeable diffuser.  The device offers four hours of continuous diffusion or up to eight hours of intermittent diffusion.  It is designed for use in small spaces like a car, office, or moving from room to room.  The diffuser comes with a dual-port USB 2.4A car adapter for easy recharging.  *never used Smoke-Free pet friendly home