LEVOIT 4L Humidifiers for Bedroom Large Room & Essential Oil Diffuser, Quiet Cool Mist for Home, Baby and Plants, Last up to 40Hours, Dual 360° Rotation Nozzles, Handle Design, Auto Shut Off, Blue

I gave it five stars because after adjusting to it, and not worrying about the little things and the false advertising of the "up to 40 hours", I find this mister a great quiet device that will impact a 400 SF room and increase the humidity level.Let's start with the cons:1. In the manual that came with the mister, and on the Amazon site it states, "up to 40 hours". Well, it might as well say up to 100 years, because both will be true, but none real. I filled the water tank and placed it to work on the Low mist setting ONLY. The tank was empty after exactly 27 hours. Yes, it worked great, very quiet, and efficient for 27 nonstop hours! So, 40? Not in this world, no matter what you do to it. Of course, it will work even less on the Medium and the High settings, but I went with the Low only.2. You can see in one of the images I added here that due to condensation at the top of the unit (mist nozle), there's water that needs to be removed before you remove the top in order to lift the water tank, else you'll have water all over your night-stand, bed, table, or wherever you placed the unit. This is not a flaw, but something I bring to your attention. Have a small towel of paper-towel next to the unit.3. The Essential Oil tray, after pressed in, pops out a fraction of an inch and there's no way to simply slide it out. I had to force the little tray after another reviewer commented that he experienced the same issue. After pinching the tray, it pops out completely (see the two images I attached) and you can place a few drops of essential oil.The good:1. A gallon of water in the tank makes it running for a long time (up to 27 hours).2. The unit is very quiet and doesn't take a lot of room on the night-stand.3. The mist setting levels (Low, Medium, High) have one toggle touch button and you can't turn the unit OFF unless you went through all three levels even if you only use the Low mist level. The manual indicates that if you touch the On/Off button for three seconds it turns OFF the LIGHT in the button, but not the unit. This is actually a good thing because the blue light from the button can be turned off, especially if you intend to let the unit work through the night.4. The unit has an Auto Shutoff sensor that will turn the unit OFF if there's no water in the tank.5. The manual is simple to follow, even if it is falsely said that the unit can work "up to 40 hours". There's an explanation on how to clean the tank, the unit, etc.6. Just like you should expect, the mister will perform best with Distilled water - it says so in the manual, and I know so from the different types I used in the past. Do not use tap water.Do I recommend it? Yes. It does what it supposed to do.

UPDATE: so i’ve had this for like, 8 months. my one issue with it is … it smells. i use distilled water. i clean it after every use and allow it to dry (i set up a small desk fan pointing straight inside of it to dry it even better) - there’s no smell once i clean it, of course.then, i add a gallon of distilled water and set it up and within a few hours (i run it on the lowest setting, and i’m sure this is the issue. because this makes it go longer than 24 hours [though this smell happens wayyy before 24 hours]. i’d guess the water lasts about 40 hours on low), it stinks up the room it’s in. it smells like when clothes don’t dry all the way. that mildew smell. when i take it apart to clean it, there’s pink stuff (bacteria) in a lot of places, especially this one piece that comes off (only way to clean it properly - see pics). this would be so perfect if it just didn’t stink up the whole area it’s in. when you smell the water coming out, while the humidifier is running, it smells like mildew and it just makes ya feel like you’re spreading that all over the room.so, my advice is - don’t run this for longer than a few hours without cleaning it. i really wish it would last a whole gallon. i don’t know what to do to make this not happen. i follow the instructions for cleaning. again, there’s no smell after cleaning and when it’s first in use. i’d love to know how to make sure this doesn’t happen. i’m fine with having to clean it. that’s just what you have to do. it’s water in a closed container. but does it have to smell.. and so soon? 😩still absolutely love the app.ORIGINAL: I am IN LOVE with this (had to say it again). I absolutely recommend it. I haven’t tried to clean it yet, but I looked at how the humidifier is put together and read the manual and it doesn’t seem all that hard - if that changes, I’ll edit this. But honestly, I was so nervous about this purchase. I looked at soooo many options and it was so overwhelming. I’m glad I settled on this one. The app is really cool. I don’t even touch the humidifier to control it at all. My son named it Wally. I have 2 hygrometers because I have a ton of houseplants and, while it’s not changing the humidity drastically (it’s not meant to. it’s meant to keep it comfortable. this isn’t gonna put your humidity at 80-90% or anything even close to that), it helps so much. Obviously I haven’t had it long enough to tell for my plants, but my boyfriends been really stuffed up and he’s been bragging about how helpful this has been. Within an hour of me having it on, he noticed a difference. We have a small 2 bedroom (752 sq ft) and I think it does well for the whole house, honestly. My hygrometer which was about 6 feet away, got to 54% with it on the second mist setting. I’ve only kept it on for a few hours at a time. I’ll set it for 4 hours here and there. I love that the app allows you to turn it off and on, set a timer for it, set how much mist you want. And you can direct the mist. It’s SUPER quiet. My space heaters are wayyy louder than this thing. 10/10 recommend. Absolutely.

I like the fact that it's quiet on all speeds. It can really raise the humidity in a good size bedroom pretty quick. I leave it on low all night and it keeps the humidity level consistent. The only thing I wish it had was top fill. I didn't realize the importance of that when shopping, but I still would recommend this brand!

My Dad is on blood thinners, he was waking up with a bloody nose everyday. So I asked his doctor what our options were, he said to get a humidifier. I got a humidifier and returned it and then I ordered another one and returned it. I did this 3 times and finally I ordered this one LEVOIT 4L. Finally, a humidifier that didn't leak everywhere and was easy to fill and clean, it was quiet and its mist was adjustable and even on low it was misting a good mist and you only have to fill it like every 3 days on medium. it automatically shuts off when it runs out of water, bonus for me for sure. and there is an on off button that you just touch that's conveniently located on the front, its touch sensitive. My dad doesn't use it in his room we keep it in our living room and run it all day. Out living room is huge and it has vaulted ceilings and it works great. I am so happy I have this humidifier, my dads nose bleeds stopped and everyone is happy. I recommend this for every one that doesn't have one and for everyone that needs one. Definately worth every penny. you wont be sorry.