Product review (4 stars): Cute little thing.
Works great - not as strong scented as expected -  a little hard to figure out at first but here are some tips:

Button on left turns it on - it will rotate through colors - if you want to stop on a certain color, press that button again.

Turn off with right button but hold down until it shuts off.

When you only have red and green showing - batteries are low and need to be changed.  Enjoy!!