1. Introduction
Thank you for choosing the CUHIOY F921WB Clip-On Rechargeable LED Reading Light. This versatile and eye-friendly lamp is designed to provide optimal illumination for various activities such as reading, studying, crafting, and more. Its portable design, flexible neck, and multiple lighting modes make it a convenient lighting solution for any environment.
Key Features:
- Rechargeable Battery: Built-in 1800mAh battery for cordless operation.
- Large Strong Clamp: Securely attaches to various surfaces without causing damage.
- Flexible Neck: Allows for 360° adjustment of light direction.
- Eye-Protect Function: Simulates diffuse natural light, reducing flicker and glare.
- Multiple Lighting Modes: 5 color settings and 5 brightness levels.
- Memory Function: Automatically remembers the last used color setting.
2. What's in the Box
- CUHIOY F921WB Clip-On LED Reading Light
- Built-in Lithium Polymer Battery
- USB-C Charging Cable (3.3ft)
3. Setup
3.1 Charging the Device
Before first use, fully charge the reading light. Connect the provided USB-C cable to the charging port on the clip and to a compatible USB power source (e.g., computer, phone charger, laptop). A full charge takes approximately 4 hours. The charging indicator light will change from red to green when fully charged.

Figure 1: Charging the CUHIOY F921WB Clip-On LED Reading Light. The image shows the light's clip base with a visible 1800mAh battery and a USB-C cable plugged in, indicating charging status with red and green lights.
3.2 Mounting the Light
The light features a large, strong U-shaped conduit clamp with padded surfaces to ensure a firm grip without damaging furniture. It can be securely attached to various surfaces such as bed headboards, bunk bed frames, bassinets, cribs, tables, desks, bookshelves, and music stands.

Figure 2: The large, strong clamp of the reading light, capable of opening up to 2.4 inches for secure attachment.

Figure 3: Dimensions and versatile mounting options for the reading light, including desks, bed frames, and bookshelves.
The flexible gooseneck allows you to easily adjust the lighting range and angle to your preference.

Figure 4: The flexible gooseneck allows for precise positioning of the light.
4. Operating Instructions
The CUHIOY F921WB features touch controls for easy operation.
4.1 Power On/Off and Brightness Adjustment
- To turn the light on, lightly touch the power icon (sun symbol) on the clip base.
- To adjust brightness, repeatedly touch the power icon. There are 5 brightness settings.
- To turn the light off, long-press the power icon for 1.5 seconds.
4.2 Color Mode Adjustment
- To change the color mode, touch the 'M' button on the clip base. There are 5 color settings available.
- The lamp automatically remembers the last used color setting.

Figure 5: The touch control panel on the clip base for adjusting brightness and color modes.
4.3 Eye-Protect Function
The round head of the light features 30 LED beads designed to simulate diffuse natural light, reducing multiple shadows, flicker, and glare. It blocks 99.95% of blue light, minimizing eye strain and creating a comfortable reading environment.

Figure 6: Internal view of the eye-caring LED design.
4.4 Video Guide: How to Use
Video 1: A short video demonstrating the basic functions and usage of the CUHIOY Clip-On LED Reading Light, including power on/off and mode changes.
5. Maintenance
To ensure the longevity and optimal performance of your CUHIOY F921WB reading light, follow these maintenance guidelines:
- Cleaning: Wipe the lamp with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Battery Care: The brightness of the light may gradually dim as the battery level drops. This is a normal function designed to protect the battery's lifespan. For extended periods of full brightness, keep the light plugged in while in use.
- Storage: Store the lamp in a cool, dry place when not in use for extended periods.
6. Troubleshooting
If you encounter any issues with your CUHIOY F921WB reading light, please refer to the following common solutions:
| Problem | Solution |
|---|---|
| Light gradually becomes dimmer after some use. | This is normal. As the rechargeable battery level drops, brightness will gradually dim to protect battery lifespan. For full brightness, keep it plugged in. |
| Light does not work immediately after unboxing. | Charge the device for 4-5 hours. Due to self-discharge during shipment, the battery may be depleted. |
| Can the battery be replaced? | No, the 1800mAh battery is built-in and not user-replaceable. Use the provided USB-C cable for recharging. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | F921WB |
| Brand | CUHIOY |
| Power Source | Battery Powered |
| Battery | 1800mAh Lithium Polymer (included) |
| Charging Port | USB-C |
| Light Source Type | LED (30 beads) |
| Brightness | Up to 450 Lumens |
| Color Temperature | 6500 Kelvin |
| Color Rendering Index (CRI) | 80.00 |
| Control Method | Touch |
| Special Features | Adjustable Arm, Color Changing, Cordless, Portable, Rechargeable |
| Mounting Type | Clip On |
| Product Dimensions | 17.5"D x 1.96"W x 4.8"H |
| Item Weight | 7.8 ounces (220 Grams) |
| Average Life | 30000 Hours |
| UPC | 192530076225 |

Figure 7: Energy label for the CUHIOY F921WB. For more details, visit EPREL Database.
8. Warranty and Support
Customer satisfaction is our priority. If you have any questions or concerns about your CUHIOY F921WB Clip-On LED Reading Light, please feel free to contact us for solutions. We are dedicated to providing reliable and eye-friendly lighting options.