1. Introduction
Thank you for choosing the let'me 2.11Gal 8L Ultrasonic Cool Mist Humidifier. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your new humidifier. Please read it thoroughly before use and retain it for future reference.
This humidifier is designed to maintain optimal humidity levels in large rooms, bedrooms, nurseries, and offices, promoting a comfortable environment for adults, babies, and plants. It features a large 8-liter capacity, quiet operation, and intelligent humidity control.
2. Safety Instructions
- Always place the humidifier on a firm, flat, water-resistant surface at least 12 inches (30 cm) away from walls and appliances.
- Do not place the humidifier directly on carpet, towels, or other absorbent surfaces.
- Use only clean, cool tap water. Distilled or demineralized water is recommended to prevent white dust buildup.
- Do not add essential oils directly into the water tank. Use the designated essential oil tray.
- Unplug the humidifier from the power outlet before filling, cleaning, or moving it.
- Keep the humidifier out of reach of children and pets.
- Do not block the mist outlet or air intake vents.
- Do not immerse the base unit in water or other liquids.
- If the humidifier is damaged, do not operate it. Contact customer service for assistance.
3. Package Contents
Verify that all items are present in your package:
- let'me 2.11 Gallon (8L) Humidifier
- Remote Control
- User Manual
4. Product Overview
Familiarize yourself with the components of your humidifier:

Figure 1: let'me 8L Ultrasonic Cool Mist Humidifier with remote control.

Figure 2: Overview of humidifier features.

Figure 3: Customizable humidity settings.

Figure 4: Mist volume settings.

Figure 5: 8L water tank capacity.

Figure 6: Essential oil tray for aromatherapy.

Figure 7: Easy top-fill and cleaning.
5. Setup
- Placement: Place the humidifier on a flat, stable surface. Ensure it is not directly on the floor if possible, and away from direct sunlight or heat sources.
- Fill Water Tank: Open the top cover of the humidifier. Fill the water tank with clean, cool tap water. For best results and to prevent mineral buildup, use distilled or demineralized water. Do not exceed the 'MAX 8L' fill line.
- Add Essential Oils (Optional): Locate the essential oil tray on the back of the unit. Push to open, add 2-3 drops of your preferred essential oil to the pad, then close the tray.
- Connect Power: Plug the power cord into a standard electrical outlet.
Video: How to Refill
Video demonstrating the easy top-fill method for the humidifier. The top section is removed, water is poured directly into the base, and the top is replaced. It also shows a quick tip to let excess water drain from the top section before reattaching.
6. Operating Instructions
Your humidifier can be operated via the touch control panel on the unit or the included remote control.
Control Panel / Remote Functions:
- Power On/Off: Press the power button to turn the unit on or off.
- Mist Volume: Select from 3 mist output levels (Low, Medium, High) to adjust the humidity intensity.
- Customize Humidity (Humidistat): Set your desired humidity level between 40% and 90% Relative Humidity (RH). The humidifier will automatically adjust its output to maintain this level.
- Timer: Set the operating time from 1 to 12 hours. The unit will automatically shut off once the set time expires.
- Sleep Mode: Activates quiet operation and turns off the display lights for an undisturbed sleep environment.
- UV/Night Light: Turn on or off the internal UV light for water purification and the colorful atmosphere light for ambiance.
Video: Humidifier in Operation
Official let'me video showcasing the 8L Humidifier for Large Rooms, highlighting its features and operation in a home setting.
7. Maintenance and Cleaning
Regular cleaning is crucial for optimal performance and hygiene.
- Daily Maintenance: Empty and rinse the water tank daily. Refill with fresh water.
- Weekly Cleaning:
- Unplug the humidifier.
- Remove the top cover and empty any remaining water from the tank.
- Clean the water tank with a soft brush or cloth and a mild detergent. Rinse thoroughly.
- To descale, fill the tank with a mixture of equal parts white vinegar and water. Let it soak for 30 minutes, then scrub and rinse.
- Clean the essential oil tray by removing the pad and rinsing it with water. Allow it to dry completely before reinserting.
- Wipe the exterior of the unit with a soft, damp cloth.
- Storage: If storing for an extended period, ensure the unit is clean and completely dry. Store in a cool, dry place.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output | Low water level; clogged transducer; mist outlet blocked. | Refill water tank; clean transducer with a soft brush; ensure mist outlet is clear. |
| Unusual noise | Unit not on a flat surface; water level too low. | Place on a flat, stable surface; refill water tank. |
| Water leakage | Overfilled tank; improper assembly of top cover. | Do not overfill; ensure top cover is securely placed and aligned. |
| White dust around unit | Using hard water. | Use distilled or demineralized water. Clean the unit regularly. |
9. Specifications
| Feature | Detail |
|---|---|
| Brand | let'me |
| Model Name | cool mist humidifier (H785) |
| Capacity | 8 Liters (2.11 Gallons) |
| Operation Mode | Ultrasonic |
| Mist Output | 3 Speed Options (Max 380mL/H) |
| Coverage Area | Up to 505 Square Feet |
| Max Runtime | Up to 48 hours (on lowest setting) |
| Noise Level | <35dB (Whisper-Quiet) |
| Special Features | Humidistat, Timer (1-12h), Sleep Mode, UV/Night Light, Essential Oil Diffuser, Top-fill, Touch Control Panel, Remote Control |
| Product Dimensions | 13.6"D x 7.7"W x 17"H |
| Item Weight | 5.82 Pounds |
| Wattage | 25 watts |
10. Warranty and Support
let'me offers the following for your product:
- 120 Days Free Exchange: For any manufacturing defects or performance issues within 120 days of purchase.
- 1-Year Quality Assurance: Comprehensive coverage for product quality for one year from the date of purchase.
- 7x24h Customer Service: Dedicated customer support available around the clock.
For any questions or concerns regarding your let'me humidifier, please contact us through your order detail page. We aim to respond within 12 hours to assist you.