I love this diffuser.  It arrived quickly, was shrink wrapped (parts were all together & clean) & the instructions were easy to follow.  I plugged it in, added the water & oil and looked for the switch to turn it on.  It didn't have one!  You tap the front "circle" and it turns on.  Want the pretty lights?  Tap the circle again.  Need it turned off?  Tap the circle again.  It was that simple.  It's been on 8 hours so far.  My house smells wonderful and there is still 1/2" of water.  I like that you can just have the lights on without the smell too.