1. Important Safety Instructions
Read all instructions and safety warnings before using this humidifier. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always place the humidifier on a firm, flat, water-resistant surface away from walls and appliances.
- Do not immerse the humidifier base in water or other liquids.
- Do not use the humidifier in wet environments such as bathrooms.
- Keep the humidifier out of reach of children and pets.
- Use only clean, distilled, or purified water. Do not add essential oils directly into the water tank.
- Unplug the humidifier before cleaning or refilling.
2. Package Contents
- 1 x Levoit NeoClassic 650S Smart Ultrasonic Cool Mist Humidifier
- 1 x User Manual
3. Setup and Placement
Follow these steps to set up your humidifier for first use:
- Unpack: Carefully remove all packaging materials from the humidifier.
- Placement: Place the humidifier on a flat, stable surface at least 12 inches (30 cm) away from walls, furniture, and other appliances. Ensure the surface is water-resistant. This humidifier is ideal for large rooms, bedrooms, and nurseries.
- Fill Water Tank: Remove the water tank cover. Fill the 6.2L tank with clean, distilled, or purified water. The top-fill design makes refilling easy.
- Connect Power: Plug the power cord into a grounded electrical outlet (120V).

Image: The Levoit NeoClassic 650S humidifier in operation, demonstrating its powerful humidification capabilities for large rooms.
4. Operating Instructions
Your Levoit NeoClassic 650S humidifier offers various modes and features for optimal comfort.
4.1 Basic Operation
- Power On/Off: Press the power button to turn the humidifier on or off.
- Mist Output: Adjust the mist level using the control panel or the VeSync app. The 360-degree rotating nozzle allows for directional mist.
4.2 Smart Features
- VeSync App & Voice Control: Download the VeSync app to control your humidifier remotely, set schedules, and access advanced features. The humidifier also supports voice control.
- Auto Mode: The intelligent Auto Mode maintains your desired humidity level with ±5% sensor accuracy, preventing over-humidification and ensuring consistent comfort.
- Night Light: Activate the blue light-safe night light for a soothing ambiance, especially suitable for bedrooms and nurseries.
- Essential Oil Function: To use essential oils, add 3-5 drops directly into the aroma chamber. Do not add essential oils directly into the water tank.

Image: The humidifier's Smart Scene Mode allows customization of mist, lighting, and music settings via the VeSync app for personalized comfort.

Image: The humidifier features a blue light-safe night light and operates at a quiet 26dB, creating a peaceful environment for sensitive sleepers.

Image: Advanced smart features accessible through the VeSync app, including scheduling, customized humidity settings, and humidity data tracking.
Video: Learn more about the features and benefits of your Levoit NeoClassic series humidifier.
Video: An overview of the Levoit NeoClassic Humidifier, highlighting its design and functionality.
5. Maintenance and Cleaning
Regular cleaning is essential for optimal performance and hygiene.
5.1 Daily Maintenance
- Empty and rinse the water tank daily.
- Wipe the base dry with a clean cloth.
5.2 Weekly Cleaning
The Levoit NeoClassic 650S is designed for easy cleaning, with dishwasher-safe components.
- Disassemble: Unplug the humidifier. Remove the water tank cover and detach the sink. All water-contact parts can be easily disassembled.
- Dishwasher Safe Parts: The water tank cover and detachable sink are dishwasher-safe.
- Dishwasher Precautions:
- Do not use dishwasher settings above 70°C (158°F).
- Use water only. Do not use dishwasher detergent or other cleaning agents.
- Base Cleaning: Clean the humidifier base with a soft brush and mild detergent if necessary. Rinse thoroughly.
- Descaling: To remove mineral buildup, fill the base with a mixture of equal parts white vinegar and water. Let it soak for 30 minutes, then scrub with a brush and rinse.
- Drying: Ensure all parts are completely dry before reassembling.

Image: The humidifier features an internal 99.9% antimicrobial shield and an external ±5% sensor-based auto mode for dual protection.
Video: An easy cleaning guide for Levoit NeoClassic humidifiers, demonstrating how to remove mineral buildup.
6. Troubleshooting
If you encounter issues with your humidifier, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| White dust around humidifier | Hard water mineral content. | Use purified or distilled water. Clean the humidifier regularly to remove mineral buildup. |
| No mist or low mist output | Low water level; mineral buildup; mist nozzle blocked. | Refill water tank; clean the humidifier, especially the transducer; ensure mist nozzle is clear. |
| Unusual noise or humming | Humidifier not on a flat surface; water quality; fan obstruction. | Place on a flat surface; use purified or distilled water; check for obstructions in the fan area. |
| Humidifier not responding after power outage | Electronic reset needed. | Unplug the unit for 5 minutes, then plug it back in. If the issue persists, contact customer support. |
7. Specifications
| Specification | Detail |
|---|---|
| Model Name | NeoClassic 650S |
| Model Number | LUH-N651S-WUS |
| Dimensions (D x W x H) | 8.8” x 8.8” x 14.1” (22.3 x 22.3 x 35.9 cm) |
| Weight | 4.9 lbs (2.21 kg) |
| Water Tank Capacity | 6.2 Liters |
| Mist Output | Up to 320 ml/h |
| Effective Range | Up to 536 ft² (49.8 m²) |
| Runtime | Up to 62 hours |
| Noise Level | ≤ 26 dB (on low setting and sleep mode) |
| Power Supply | AC 120V, 60Hz |
| Rated Power | 30W |
| Material | BPA-free waterpath, Food Grade Materials |
| Special Features | Auto Mode, Auto Shut Off, Dishwasher Safe (Detachable Sink and Water Tank Cover), Night Light, Removable Tank, Scene Mode, Smart Control, Voice Control |

Image: A comparison chart detailing the specifications and features across the Levoit NeoClassic Series, including the 650S model.
8. Warranty and Support
Warranty Description: Levoit offers a Satisfaction Guaranteed warranty. If your product is defective, the California-based Customer Support Team will send a replacement without requiring you to ship the original back.
For additional coverage, an extended warranty may be available for purchase through Amazon to extend protection up to 3 years.
Contact Support: For any questions, concerns, or issues with your product, please contact Levoit Customer Support. Refer to the official Levoit website or the VeSync app for contact information.
User Manual (PDF): For a downloadable PDF version of this manual, please visit the official Levoit support page or refer to the link provided with your purchase.





