Xiaomi Mijia Smart Sterilization Humidifier S 4.5L
৳ 6,490
- Brand: Xiaomi
- Model: Mijia Smart Sterilization Humidifier S
- Water Tank Capacity: 4.5 Liters
- Power Consumption: 26W
- Humidification Method: Evaporative
- UV Sterilization: Yes, built-in UV-C light
- Connectivity: Wi-Fi, compatible with Mi Home app
- Dimensions: 270 x 270 x 330 mm
- Weight: 2.3 kg
- Noise Level: ≤ 38 dB
Xiaomi Mijia Smart Sterilization Humidifier S 4.5L
The Xiaomi Mijia Smart Sterilization Humidifier S 4.5L is a smart home appliance designed to add moisture to indoor air while providing convenient humidity control. It combines a large water tank, UV-C sterilization, adjustable mist output, and app connectivity in one compact device.
For customers in Bangladesh, this Xiaomi Mijia humidifier offers a practical way to manage indoor humidity during dry weather and in air-conditioned rooms. Its 4.5-liter water tank reduces the need for frequent refilling, while its smart features make everyday operation easier.
If you want to buy Xiaomi Mijia Smart Sterilization Humidifier S 4.5L from Gears Wheel at a low price in Bangladesh, understanding its features, specifications, and operation will help you make an informed purchase.

Xiaomi Mijia Smart Sterilization Humidifier S 4.5L: Product Overview
The Xiaomi Mijia Smart Sterilization Humidifier S is an ultrasonic humidifier that uses high-frequency vibrations to turn water into a fine mist. It releases this mist into the surrounding air, increasing indoor humidity when the air is dry.
Unlike a basic humidifier, this model combines moisture control with UV-C water sterilization and smart connectivity. As a result, it offers several functions in a single appliance.
The device is designed for indoor use in bedrooms, living rooms, and other suitable spaces. Its minimalist appearance also makes it easy to place alongside other home appliances.
Key Features at a Glance
- 4.5-liter water tank for extended humidification.
- Up to 450 ml/h mist output for adjustable moisture delivery.
- UV-C sterilization technology for treating water inside the humidifier.
- Water-softening resin filter to help reduce mineral residue.
- Three mist output levels for different humidity requirements.
- Mi Home app connectivity for smart control.
- Automatic humidity adjustment and over-humidity protection.
- Low-noise operation for everyday indoor use.
These features make the Xiaomi Mijia Smart Sterilization Humidifier S a useful option for people who want a smart and convenient way to manage indoor humidity.
Xiaomi Mijia Smart Sterilization Humidifier S 4.5L Specifications
The following specifications are based on available product information for the MJJSQ03DY model. Some sellers list different power ratings, noise levels, and operating times, so the specifications should be checked against the exact model supplied.
| Specification | Details |
| Brand | Xiaomi Mijia |
| Model | MJJSQ03DY |
| Water tank capacity | 4.5 liters |
| Maximum mist output | Up to 450 ml/h |
| Mist settings | 3 levels |
| Sterilization | UV-C |
| Water treatment | Softening resin filter |
| Humidity control | 40% to 70% RH, adjustable |
| Connectivity | 2.4 GHz Wi-Fi |
| App | Mi Home |
| Power input | 220V, 50Hz |
| Dimensions | Approximately 190 × 190 × 353 mm |
| Noise level | Reported at up to 39 dB |
The product specifications are reported by retailers and product documentation. Actual performance can vary with operating settings and room conditions.
4.5L Large Water Tank for Longer Humidification
One of the main features of the Xiaomi Mijia Smart Sterilization Humidifier S 4.5L is its large water tank. With a capacity of 4.5 liters, it can hold enough water for extended operation without constant refilling.
This is particularly useful when the humidifier is used in a bedroom or living room for several hours. Instead of repeatedly stopping the appliance to add water, you can enjoy longer periods of humidification.
The actual operating time depends on the selected mist level. At the maximum output of 450 ml per hour, a full 4.5-liter tank would theoretically last around 10 hours. At a lower output, it can last longer.

Convenient Top-Fill Design
The top-fill design makes adding water more convenient. You can refill the tank from above without having to dismantle the entire appliance.
This is a practical feature for regular household use. It also makes the humidifier easier to manage when the water level becomes low.
UV-C Sterilization Technology
The Xiaomi Mijia Smart Sterilization Humidifier S includes a UV-C sterilization function designed to treat the water inside the device.
UV-C light is a form of ultraviolet radiation used in certain disinfection systems. It can damage the genetic material of microorganisms, reducing their ability to reproduce.
In this humidifier, the UV-C function is intended to help reduce microbial contamination in the water before it is dispersed as mist.
What Does UV-C Sterilization Mean?
The sterilization feature is an important part of the product’s design. However, it should not be interpreted as a guarantee that all indoor air becomes sterile or that the appliance can prevent illness.
Its function is focused on water treatment inside the humidifier. Regular cleaning and proper maintenance remain important for keeping the device in good condition.
The advertised 99.9% sterilization figure appears in retailer descriptions. It should be understood as a manufacturer or seller performance claim rather than a guarantee of complete disinfection under every condition.
Water-Softening Resin Filter
Another notable feature is the water-softening resin filter. This component is designed to reduce the amount of certain dissolved minerals in the water.
Tap water can contain calcium and magnesium. When mineral-rich water is dispersed through a humidifier, some of these minerals may remain behind as a fine white residue.
The resin filter helps reduce this issue by treating the water before humidification.
Why Water Softening Matters
Reducing mineral residue can help keep nearby surfaces cleaner. It can also reduce mineral buildup inside the appliance over time.
However, the filter does not eliminate the need for cleaning. Its effectiveness depends on the water quality and the condition of the filter.
The filter should be maintained or replaced according to the instructions supplied with the product.
Adjustable Mist Output and Humidity Control
The Xiaomi Mijia Smart Sterilization Humidifier S provides three mist output levels. This allows users to adjust the amount of moisture released into the room.
For example, a lower setting may be suitable when the room needs only a small amount of additional moisture. A higher setting can provide more humidification when the air is particularly dry.
The device also supports constant humidity settings within a reported range of 40% to 70% relative humidity.
Automatic Humidity Adjustment
Automatic humidity control helps regulate the humidifier’s operation according to the surrounding humidity level.
This feature can reduce the need for constant manual adjustments. It is especially useful when indoor conditions change throughout the day.
The humidifier also includes over-humidity protection. This helps prevent the device from continuing to release excessive mist when the surrounding humidity remains high.
Still, the ideal humidity level depends on the room, season, and personal comfort. A separate humidity meter can help users understand their indoor conditions more accurately.
Smart App Control with Mi Home
The Xiaomi Mijia Smart Sterilization Humidifier S supports smart control through the Mi Home app, also known as Xiaomi Home in some regions.
With a compatible phone and a supported app connection, users can manage selected humidifier functions without relying entirely on the physical controls.
What Can You Do with the App?
Depending on the model, firmware, and app region, supported functions may include:
- Adjusting mist output.
- Setting a target humidity level.
- Monitoring humidity information.
- Changing operating modes.
- Checking the device’s connection status.
The app provides a convenient way to manage the humidifier while moving around the home. However, some smart functions may require the correct regional version of the app.
Voice control is also advertised for certain versions of the device. Compatibility depends on the specific model and its software configuration.

Low-Noise Operation for Everyday Comfort
Noise is an important consideration when choosing a humidifier for a bedroom or study area. The Xiaomi Mijia Smart Sterilization Humidifier S is designed for relatively quiet operation.
Retailer specifications report noise levels of approximately 34 to 39 dB, depending on the operating mode and product version.
This makes it suitable for many everyday indoor settings, including bedrooms and workspaces.
However, the actual sound level may change with the mist setting, water level, and surrounding environment. A higher output setting may produce more noticeable operating noise than a lower setting.
Modern Design for Different Rooms
The Xiaomi Mijia Smart Sterilization Humidifier S features a simple, modern design that fits naturally into many home environments.
Its compact footprint allows it to sit on a suitable flat surface without taking up excessive space. The neutral appearance also complements different interior styles.
The appliance is suitable for spaces such as:
- Bedrooms and sleeping areas.
- Living rooms and family spaces.
- Home offices and study rooms.
- Other indoor areas where additional humidity is needed.
The humidifier should be placed on a stable, water-resistant surface with enough clearance around its air inlet and mist outlet. It should not be positioned where moisture can damage furniture, electronics, or other nearby items.
Using the Xiaomi Mijia Smart Sterilization Humidifier S in Bangladesh
Bangladesh experiences different humidity conditions throughout the year. During humid weather, indoor air may already contain substantial moisture. During cooler or drier periods, indoor humidity can fall, particularly in air-conditioned rooms.
The Xiaomi Mijia Smart Sterilization Humidifier S can help add moisture when indoor air is dry. However, it is not necessary to operate a humidifier continuously when the room is already sufficiently humid.
Suitable Indoor Use
The humidifier can be useful in air-conditioned bedrooms, living rooms, and other indoor spaces where dry air causes discomfort.
For best results, consider the following:
- Check the room’s humidity before operating the device.
- Select a mist setting that suits the room’s conditions.
- Avoid directing mist toward walls, furniture, or electronic equipment.
- Use the automatic humidity function when appropriate.
- Turn off the appliance when additional humidification is unnecessary.
These basic practices help make humidifier use more comfortable and reduce the chance of excessive moisture accumulating indoors.
Cleaning and Maintenance
Regular cleaning is essential for any humidifier. Water that remains inside a humidifier can support microbial growth if the appliance is not maintained properly.
The Xiaomi Mijia Smart Sterilization Humidifier S includes UV-C sterilization, but that feature does not replace routine cleaning.
Recommended Maintenance Practices
- Switch off and unplug the humidifier before cleaning or refilling it.
- Empty any remaining water before cleaning the tank.
- Clean the water tank and accessible components according to the manufacturer’s instructions.
- Avoid using harsh chemicals or abrasive materials that could damage the appliance.
- Keep the mist outlet and air inlet clear.
- Check the water-softening filter and replace it when required.
Always follow the supplied user manual for specific cleaning instructions. The electrical base should never be immersed in water.
Xiaomi Mijia Smart Sterilization Humidifier S 4.5L Price in Bangladesh
The price of the Xiaomi Mijia Smart Sterilization Humidifier S 4.5L in Bangladesh can vary between sellers and may change with stock availability or promotional offers.
When purchasing this model, customers should check the current price, product version, included accessories, and applicable warranty terms.
At Gears Wheel, customers can explore the Xiaomi Mijia Smart Sterilization Humidifier S 4.5L as part of the smart home appliance collection.
The product combines a large water tank, adjustable humidification, UV-C water treatment, and app-based control in a single device.
For customers looking for a Xiaomi Mijia humidifier in Bangladesh, these features provide a useful starting point when comparing available models.

Frequently Asked Questions
What is the Xiaomi Mijia Smart Sterilization Humidifier S 4.5L?
It is a smart ultrasonic humidifier designed to increase indoor humidity. It features a 4.5-liter water tank, UV-C sterilization, adjustable mist output, and Mi Home app connectivity.
What is the water tank capacity?
The water tank has a capacity of 4.5 liters. This allows the humidifier to operate for extended periods without frequent refilling.
What is the maximum mist output?
The maximum reported mist output is 450 ml per hour. The actual output depends on the selected operating level and the specific product version.
Does the humidifier have UV-C sterilization?
Yes. The device includes UV-C sterilization technology designed to help reduce microbial contamination in the water inside the humidifier.
Can the humidifier be controlled through a smartphone?
Yes. It supports the Mi Home app, allowing users to access supported smart control functions through a compatible smartphone.
How many mist settings does it have?
The model is reported to have three mist output levels. These allow users to adjust humidification according to their indoor conditions.
Does it support automatic humidity control?
Yes. The humidifier supports automatic humidity adjustment and a constant humidity mode. The reported adjustable range is 40% to 70% relative humidity.
Is the Xiaomi Mijia Smart Sterilization Humidifier S noisy?
It is designed for relatively quiet operation. Reported noise levels vary by product version and operating setting, with retailer specifications ranging from approximately 34 to 39 dB.
Can it be used in a bedroom?
Yes. Its compact design and low-noise operation make it suitable for bedroom use when additional humidity is needed.
Does the humidifier need regular cleaning?
Yes. Regular cleaning is important to maintain the appliance and prevent unwanted buildup inside the water tank. UV-C sterilization does not eliminate the need for cleaning.
Can it be used with the Mi Home app in Bangladesh?
The device supports Mi Home connectivity, but app compatibility can depend on the model’s regional version and firmware. Customers should verify compatibility before purchasing.
Where can I buy Xiaomi Mijia Smart Sterilization Humidifier S 4.5L in Bangladesh?
Customers can check Gears Wheel for product availability, current pricing, and purchase information.

The Xiaomi Mijia Smart Sterilization Humidifier S 4.5L combines a large water tank, adjustable mist output, UV-C sterilization, water-softening filtration, and smart app control in one modern home appliance. Its convenient design and humidity management features make it a practical option for bedrooms, living rooms, and other indoor spaces where additional moisture is needed. For customers in Bangladesh, the model offers a useful combination of everyday humidification and smart home functionality.
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Delivery & Shipping Process:
- Cash on delivery within Dhaka (Tk 70 delivery charge.
- 130 taka delivery charge outside Dhaka must be paid in advance, the price of the products is cash on delivery.
- Order processing may take up to 24 hours.
- Delivery may take 24-36 hours within Dhaka.
- Delivery may take 2-4 days outside Dhaka.
- The customer can check the product in front of the delivery person by talking to the seller.
- Unboxing video must be kept for warranty claim.
Warranty & Return-Refund Policy
Warranty:
- We usually have a 3-day replacement warranty.
- In case of any problem from the manufacture, please contact us immediately, within 3 days. After 3 days warranty cannot be claimed under any circumstances.
- For warranty claim the product should be brought to our shop along with the cash memo, product packaging. Or you can send it by delivery man, the customer will have to bear the delivery charge.
- 3-4 weeks wait for brand warranty.
- Product quality depends on the manufacturer. No affiliation with gearswheel. You cannot return a product if you do not like the quality of the product.
Return Policy:
- If the product is not genuine or original. You must inform us within 24 hours.
- If you receive a physically damaged product after opening the package. (must send unboxing video)
- If the product is different from the product ordered. (wrong product is)
- If you change your mind/ordered in wrong order.(Product must be sealed.Product cannot be returned after opening
- 3-4 weeks wait for brand warranty.
- You will be responsible for paying your own shipping costs to return your item. Shipping costs are non-refundable, if you receive a refund, return shipping costs will be deducted from your refund.
Refund Policy:
- If we are unable to deliver the product you ordered (if out of stock)
- If you change your mind and inform us before the goods are delivered.
- It will take 7-14 working days for the refund to be successful.
- Once we receive your item, we will inspect it and notify you that we have received your returned item. We will notify you of the status of your return immediately after inspecting the item.
- The refund period may vary depending on your card issuer's policy.
- You will be responsible for paying your own shipping costs to return your item. Shipping costs are non-refundable, if you receive a refund, return shipping costs will be deducted from your refund.
How To Do Warranty Claim and Get Refund?
- You can message us on Facebook.
- You can contact us on WhatsApp (01946004706).
- You can call directly (during office hours)
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