New Green air send me one of their Scent Pods run off two batteries or powered by your USB port. These do not seem as powerful as all the other New Green Air diffusers that I have, but are great to help create a nice scent in your work space.
You put a couple drops of oil on the pads and place it inside the pod and close. Its that easy. This doesn't put off a mist like the ultrasonic diffusers. The fan pushes the scent around.
This was not one of my favorites though. It doesn't seem to diffuse, just put scent in the air, but definitely good for the office for more aromatherapy than diffusing.