Introduction
The NOW Solutions Ultrasonic USB Oil Diffuser combines aromatherapy with modern scientific innovation. This BPA-free diffuser operates without heat, preserving the integrity and holistic properties of essential oils. It generates an ultra-fine mist using high-frequency ultrasonic electrical vibrations. Designed for ease of use and portability, it can be powered via a laptop or any USB port, making it suitable for various environments.
Features
- Extremely Quiet Operation: Ensures a peaceful environment.
- Easy to Clean: Simple maintenance for lasting performance.
- Heat-Free Diffusion: Utilizes cool steam to maintain essential oil integrity and properties, eliminating the risk of burns.
- Automatic Shut-Off: For safety and convenience, the unit turns off when water levels are low.
- BPA-Free Construction: Made with safe, non-toxic materials.
- Long Run Time: Diffuses for up to 4 hours.
- Versatile Power Options: Plugs into a laptop or any USB port.
- Color Changing LED Lights: Offers rotating LED lights for ambiance, with an option to turn lights off.
- Compact Design: Ideal for home or office use.

This image highlights the key features and specifications of the diffuser, including its quiet operation, ease of use, and LED lighting options.
Specifications
| Model | 7523 |
| Color | Off White |
| Material | Plastic |
| Water Capacity | 70 ml (2.37 fl. oz.) |
| Run Time | Up to 4 hours |
| Misting Modes | Continuous / Off |
| Light Modes | Color Rotating / Off |
| Coverage Area | Up to 200 sq. ft. |
| Power Source | 5V USB (Corded Electric) |
| Wattage | 5 watts |
| Dimensions (L x W x H) | 8" x 3" x 8" |
| Item Weight | 5.04 ounces |
Setup
- Connect Power: Plug the provided USB cable into the diffuser and connect the other end to a laptop or a wall outlet with a USB adapter (not included).
- Remove Cover: Gently twist and lift the top cover of the diffuser.
- Add Water: Fill the water reservoir with room temperature tap water. Do not exceed the maximum fill line (70 ml / 2.37 fl. oz.) indicated inside the reservoir. Using cold water may affect performance.
- Add Essential Oils: Add 3-5 drops of your preferred NOW Essential Oil directly into the water reservoir. Adjust the number of drops based on desired aroma intensity.
- Replace Cover: Carefully place the top cover back onto the diffuser, ensuring it is securely seated.

This diagram illustrates the simple four-step process for setting up and using the diffuser.
Setup Video Guide
Official video from NOW Foods demonstrating how to set up and use your USB Oil Diffuser, including adding water and essential oils, and operating the light and mist functions.
Operation
Once the diffuser is set up and powered, use the single button on the front to control its functions:
- First Press: Turns on the diffuser with continuous mist and rotating LED lights.
- Second Press: Turns off the LED lights, while the mist continues to diffuse.
- Third Press: Turns off the diffuser completely (both mist and lights).
The diffuser will automatically shut off when the water level is too low.
Maintenance
Regular cleaning helps maintain the diffuser's efficiency and extends its lifespan. Clean the unit every few uses or when changing essential oils.
- Unplug and Disassemble: Ensure the diffuser is unplugged from the power source. Remove the top cover.
- Empty Water: Carefully pour out any remaining water from the reservoir, avoiding the air outlet.
- Clean Reservoir: Use a cotton swab dipped in rubbing alcohol to gently wipe down the inside of the water reservoir, paying close attention to the ultrasonic disc and any smaller parts. This helps remove essential oil residue or mineral buildup.
- Wipe Exterior: Wipe the exterior of the diffuser and the inside of the cover with a soft, damp cloth.
- Dry Thoroughly: Allow all parts to air dry completely before reassembling or storing the diffuser.
Troubleshooting
- No Mist/Unit Not Turning On:
- Ensure the unit is properly plugged into a working USB port or wall adapter.
- Check if the water level is above the minimum and below the maximum fill line.
- Confirm that room temperature water was used. Cold water can sometimes prevent the unit from operating.
- Clean the ultrasonic disc as per the maintenance instructions to remove any blockages.
- Weak Mist:
- Ensure the water level is appropriate.
- Clean the ultrasonic disc and air outlet to ensure no residue is impeding mist production.
- Leaking:
- Ensure the top cover is securely placed and aligned correctly.
- Do not overfill the water reservoir beyond the maximum fill line.
Safety Information
- This product is not a toy. Keep out of reach of children and pets.
- Do not use with cold water; use room temperature tap water only.
- Do not exceed the maximum fill line in the water reservoir.
- Always unplug the diffuser before cleaning or refilling.
- Avoid direct contact of essential oils with skin. Always dilute essential oils before topical use.
- Do not tilt or move the diffuser while it is operating or contains water.
- Ensure the diffuser is placed on a stable, flat surface.
Warranty and Support
This diffuser comes with a 1-year manufacturer guarantee.
For assistance or warranty claims, please contact customer service at 1-888-548-0040.