

💨 Elevate your air game — breathe smarter, live better!
The LEVOIT OasisMist 4.5L Smart Humidifier combines large-capacity ultrasonic humidification with warm and cool mist options, smart app and voice control, and whisper-quiet operation. Designed for large rooms up to 430 sq ft, it features auto humidity adjustment, effortless top-fill design, and an aroma diffuser for customizable wellness. Perfect for improving sleep, relieving congestion, and creating a spa-like atmosphere with minimal effort.












| ASIN | B0B1DQ8KV3 |
| Best Sellers Rank | #8,997 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #24 in Humidifiers |
| Brand Name | LEVOIT |
| Capacity | 4.5 Liters |
| Color | White |
| Control Method | Voice |
| Customer Reviews | 4.3 4.3 out of 5 stars (5,331) |
| Filter Type | Water Filter Sponge |
| Floor Area | 430 Square Feet |
| Global Trade Identification Number | 00810043375542 |
| Included Components | 1 × 4.5-Liter Smart Warm & Cool Mist Humidifier, Aroma Pad, Cleaning Brush, Water Filter Sponge |
| Item Dimensions D x W x H | 10.8"D x 6"W x 11.97"H |
| Item Shape | Rectangular |
| Item Type Name | Auto Customized Humidity, Ultrasonic Top Fill Oil Diffuser for Baby and Plants, Quiet, 4.5L |
| Item Weight | 5.3 Pounds |
| Manufacturer | LEVOIT |
| Material | BPA-Free Meterial, suitable for babies and adults |
| Model Name | OasisMist Smart Cool and Warm Mist Humidifiers for Bedroom Large Room Home, |
| Model Number | LUH-O451S-WUS |
| Operation Mode | Ultrasonic |
| Other Special Features of the Product | Aroma Diffuser, Auto Shut Off, Humidistat, Remote Control, Schedule, Smart Vesync APP, Voice Control, Warm and Cool Mist for Faster and Healthier Relief |
| Power Source | ETL Certified AC Power Adapter |
| Room Type | Baby,Bedroom,Bedrooms |
| Runtime | 45 hours |
| UPC | 810043375542 |
| Voltage | 120 Volts |
| Wattage | 12 watts |
L**E
Great product, works immediately
Wow - my sleep quality went from a 2 to a 10 in my house! I wasn’t sure why my sleep was so awful and it seems new heater devices in house just fried-dried up my house. I thought it was just typical wintertime but nope- this humidifier took my rooms from 29% to 57% and I couldn’t be happier in may 30?minutes tops! . The device shows you the humidity levels, gives you cool or warm mist and three levels too. Super easy to use and clean. The sound isn’t bad but the higher the mist level the more sound you hear so I put it in low overnight. To be able to breathe fully is priceless! The thing stays lit but I just face it backward at night. I’ve run this almost continuously 24/7 since I received it and I’ve had zero issues. One of the best buys I’ve made from Amazon.
K**G
The Best Humidifier I’ve Ever Owned – Worth Every Penny! A Game-Changer for Comfort and Health
I recently bought the Levoit OasisMist 450S Smart Humidifier, and it has honestly changed our lives—especially for my daughter. She used to get sick often during the winter with constant coughing and congestion at night. Since using this humidifier, she’s not feeling nearly as sick anymore, and her nighttime congestion has improved dramatically. It even helps reduce her cough and cold symptoms within just one night. I was blown away by how fast it worked. What I Love: • Warm & Cool Mist: We mostly use the warm mist at night, and it’s been amazing for clearing up stuffy noses. The cool mist is great during the day or in warmer weather. • Smart Controls: I use the VeSync app to control everything from my phone. I can check humidity levels, set timers, or just adjust the mist level without getting up. • Auto Mode: This is one of my favorite features—it senses the room’s humidity and adjusts automatically, so I don’t have to think about it. • Large Tank & Top Fill: The 4.5L tank lasts through the night and then some. Top-filling is super convenient, and it’s easy to clean. • Quiet Operation: It runs silently, so it doesn’t disturb my daughter’s sleep at all. • Aromatherapy Option: I add a couple of drops of lavender oil at bedtime, and it helps create a calm, spa-like vibe in her room. We use the aroma box regularly, and when my daughter is sick, I put Vicks drops on aroma pad and place it near the nozzle. It works like a charm to open up her airways and ease her breathing overnight. Final Thoughts: If your kids struggle with winter colds, coughs, or nighttime stuffiness, I highly recommend this humidifier. It made a noticeable difference after just one night, and it’s now part of our daily routine. Levoit really nailed it with the OasisMist 450S—worth every penny!
B**W
Best room humifier with automatic mode
Love this humidifier. It works great. Top fill is the way to go. Less chance of leaks and easy to fill. The auto mode is very nice it adjusts as needed, warm or cool. Very easy to use. Works great. Definitely recommend getting the extra pads and filters. They keep unit cleaner. I like that I can use functions without the app. Highly recommend this unit for smaller rooms. I have this unit and the LV600S which I highly recommend also. I like the lv600s better for you can adjust the humidity % and its larger tank, and the fill area.
V**B
Works great! Quite! Functionality locked behind an app :(
Okay, so this unit looks great, works super well, and is easy to clean! I purchased mine to help my skin in the winter/drier months. I like that it has an auto mode which maintains a humidity, different mist warmth settings, and is very quite. I DO have issues with it though. Features/functionality were purposefully left off of the actual unit in order to force buyers to use their app- yup they want access to your wifi, location, and all the other juicy privacy data they can sell; oh, and of course, when you open the app there's multiple notification marks to entice you into other menus which are advertising their other products. The unit has a sleep button- this will not work the way you think it would. It's not a setting for you to use at night when you sleep. It turns off any warmth setting, display, and runs *continually*. The first night I used it, I woke up to greenhouse of a room; when I turned the display back on, it read that the room was at 95% humidity. The sleep setting is just a low-noise, no-display mode, and needs constant tending to maintain a target humidity level- it does not auto shut off. Target humidity can be set, but you need to do it in the app. I see no reason the buttons on the device couldn't be multi-purpose. E.g. long-hold the auto button and enter a mode which allows you to adjust the target humidity with the other buttons. Same for the display, long-hold on/off or sleep to turn the display off. So how do you use this at night? Download the app... set your target humidity level, put the device in auto, adjust the warmth setting to your preference, and then scroll to the bottom of the app and find the toggle to turn off the display. Doing all this will let your device run at night with the display off and will turn itself off/on to maintain the target humidity. I honestly want to rate this lower because I just don't believe this needs an app (I'm very concerned about data privacy), and I know exactly why this was made the way it was...but it just works well. It's so quite, maintains humidity well, and is easy to maintain.
C**A
This humidifier is so quiet! It is in a large room, but it’s really just for me and it’s still keeping it at about 50% humidity. I have it set on the highest setting and the tank has lasted 24 hours. Super easy to fill, either by removing the tank and filling elsewhere or filling from the top. Very happy about this purchase!
P**E
I started using the OasisMist 600S and I’ve noticed quite the difference in the air quality of my home. It covers a large area easily, and the various modes do a great job at maintaining the perfect humidity level. The unit is quiet and the top-fill design makes refilling a breeze. I was also happy to find that maintenance is straightforward; I’ve cleaned it once so far and the process was quick and easy. Great product from Levoit, highly recommended!
E**O
Excelente, relación calidad y precio. Sin ruido excepto nivel de vapor caliente sin embargo es mínimo el ruido. Suficiente 2L para 8 horas. Agregue un caballito de vodka para mejorar las vías respiratorias. Recomendable 100%.
K**S
Compact size, extremely quiet. Use it every night with setting on sleep mode.
S**N
Excelente ayuda para dos problemas de salud agravados por la calefacción y el frío seco: ojo seco, fosas nasales y piel resecas. Muy notoria mejoría desde la primera noche. Además: ofrece vapor tibio (con tres niveles de temperatura) o frío, en ambos casos, con 3 niveles de intensidad o cantidad de vapor; tanque de agua grande que me dura hasta para 3 noches (no lo uso durante el día); detector que apaga el aparato automáticamente al quedarse sin agua, lo que evita descomposturas o accidentes; encendido y apagado automático y programable desde un aplicación fácil de descargar y usar, después de conectar el aparato a un teléfono o tableta mediante Wifi e identificar el humidificador (operaciones fáciles aunque NO soy un joven experto en computadoras y celulares) y un manual muy claro y completo, incluidas instrucciones muy importantes para limpiarlo y evitar descomposturas o que se formen hongos. Ruido muy moderado y luz del panel de control muy discreta que no me han causado problema alguno para dormir. La luz del panel puede apagarse, manualmente o al ponerlo en la función “Sleep” o Dormir. Varias de las críticas en otras reseñas se deben a no leer o no seguir sistemáticamente las instrucciones del manual, incluido el tipo de agua a usar, etc. Feliz con este humidificador que escogí después de leer muchas reseñas sobre distintas marcas y modelos. Para mí, vale lo que cuesta.
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