Spend a little more money and get something of better quality
A Dr. recommended that I try an ultrasonic mister for a chronic sinus problem. I didn't want to spend a lot of money until I was sure it would help... I got just what I paid for. The reservoir will hold only enough water for about 6 hours (not an entire night). It also doesn't separate from the base without a struggle. The carrying handle broke off once while trying to get the two apart (I glued it back in place). The red light on the on/off switch is so bright that I had to cover it with duct tape.<br />I'm giving it two stars because it does work but the next one I buy will be a little more user-friendly.
Rating: 2 stars