Mammoth Serenity Ultrasonic Essential Oil Aromatherapy Diffuser 135mL (Pearl Black)

I don't know what happened to this diffuser but it worked just fine the one time I used it. When I refilled it the same way I did the first time, the little red light was faded, blinks, but just won't turn on. I liked this color and size so much. In addition, it's very hard to open the top and open the inside top to refill it. The top is suppose to open when you turn it counter-clockwise slightly but it fits so snugly that it takes time to get the top to loosen enough to open. The inside top opens from the outside rim and not in the middle.I sent feedback to the seller but have not heard anything back. I even went to Mammoth's website but there were no troubleshooting instructions, actually no instructions at all, except what's on the box. I'm so disappointed. I bought another one but had to get it in a dark fake wood-like color instead.

First of all, let me say that I love this diffuser. The look is very nice and it has a low "white nose" hum when it is on. I gave it four stars because it is very temperamental and all parts have to be exactly in place for it to work properly. Even though I watched the video,I still had an issue with it and I thought it was broken. The only other issue is that it has these lights that don't go off. Since it is black, I just put a few pieces of electrical tape over them. It's perfect now!

This is a great little diffuser! It operates like all the ultrasonic diffusers and puts out enough mist to fill a small room with scent. I have had it running almost continuously for the last two days and it has had no problems. One reviewer stated that there was a design flaw because the unit will stop running because of a low water level when it actually still has water in it. This is true, but I like this feature because it allows me to use citrus oils in it because they won't touch the vibration plate (oil floats on water). The directions are clear on how the buttons operate, so I'm not sure why some people can't figure it out. I set the unit on the 2min on/2min off setting and it was still running when I woke up. I have the glossy black unit and it was a little difficult opening the unit the first couple times, but it is not a problem anymore. The lights do not bother me, but the two small leds on the outside of the unit are a little bright. Overall I am happy with this purchase, it works and it was very affordable.

Liked the design. Could be easier to open. Returned b/c it didn't output and had red over/under-filled light on full-time.

I like the diffuser, but there are so many annoying aspects to the product design, but few of my observations are mentioned. So:1. I can't believe how much time I spend trying to take the outer and inner plastic caps off. Both tops are round and compression fitted - they don't screw on. This is the worst aspect of its design. My hands are strong and fit, so people with weak or arthritic hands may be frustrated with this aspect.2. The directions are poor - and they are on the package and hard to read and comprehend.3. There is no on/off switch. There are two buttons that must be depressed sequentially, in accordance to the box directions.4. There is ALWAYS a red LED on. It never goes off, unless you unplug the machine, which I often do. How long will it last if I keep unplugging it?5. I called the number on the box (ahem: user manual) to reach customer support. Guess what?! It's not the right number. This number is for Sun Chemical Corporation! How crazy is that?6. When it is on, it works great, and I like it. But it's the only thing I like about it.I give it one star for product design, five for operation. I haven't decided if I want to keep it.

Okay... I bought 3 of these (tan wood, dark wood and this black one that no longer works) and a larger MIU 500ml color diffuser through my Amazon Prime about 12 months ago. The one I am unhappy about just won't stay on unless I hold the button in, it stopped working after 7 months and then worked again. So basically it is useless to me. To be honest I only turn them on when company is coming (which isn't that often lol).Does anyone have a clue on how to fix it. How do I return this or get it repaired?

I really like this product. It is quiet and runs for several hours. My problem is that it really doesn't come with any instructions. There are a few on the outside of the box but nothing in detail. It was trial and error to figure out how to open it and get it to work

Small, quiet and does what it is supposed to do. That said, a little pre- planning is in order. I have small, arthritic hands and initially it was hard to remove the top which has to be slightly twisted and lifted. Therein was a huge problem for me...easily solved with a piece of the rubber non slip that is used under area rugs. (If you don't have that, the rubber jar openers work well too. I use the fingers of both hands on the edges of the top section of the machine and simply lift. The inside white cover is easily lifted. The machine on the 3 minuite on/off vapor delay gives about 8 hours of diffusion. I absolutely love this machine. It is just the right size for bedside evening aromatherapy.