Introduction
Thank you for choosing the Monotremp Book Light. This compact and versatile reading light is designed to provide comfortable illumination for various activities, including reading in bed, crafting, or working on a laptop. With its adjustable brightness, color temperatures, and lightweight design, it offers an optimal lighting experience while being gentle on your eyes and considerate of others around you. Please read this manual carefully to ensure proper use and maintenance of your device.

Image: The Monotremp Book Light illuminating an open book, showcasing its flexible gooseneck and clip.
What's in the Box
- 1 × Monotremp Book Reading Light
- 1 × USB Charging Cable
- 1 × User Manual (this document)
Product Features
- Customizable Illumination: Features 3 color temperatures (Cool Light, Daylight, Warm Light) and 3 brightness levels, allowing for 9 distinct lighting modes to suit various environments and preferences.
- Long-Lasting Rechargeable Battery: Built-in battery provides 4 to 80 hours of light depending on the brightness setting. Fully recharges in approximately 1.5 hours via the included Micro USB cable.
- Ultralight and Portable Design: Weighing only 1.3 ounces (37 grams), the light is exceptionally lightweight and features a foldable design for easy portability, making it ideal for travel.
- Well-Designed Clip: The non-slip clip opens up to 1.2 inches, providing a secure grip on books, e-readers, tablets, and other objects. Soft sponge padding protects surfaces from marks.
- Flexible Metal Gooseneck: A durable metal gooseneck allows for 360-degree adjustment, enabling precise positioning of the light exactly where needed, ensuring stability during use.
- Eye-Friendly Lighting: Designed to provide even, flicker-free illumination that reduces eye strain, making it comfortable for extended reading sessions.

Image: Visual representation of the 9 lighting modes, combining 3 brightness levels with 3 color temperatures.

Image: The book light is USB rechargeable, compatible with various power sources like AC adapters, power banks, and computers.
Setup
Charging the Book Light
- Locate the Micro USB charging port on the side of the clip base.
- Connect the included USB charging cable to the port.
- Plug the other end of the USB cable into a compatible USB power source (e.g., computer USB port, USB wall adapter, power bank).
- The indicator light will illuminate during charging and turn off when fully charged. A full charge takes approximately 1.5 hours.
Attaching the Book Light
- Gently press the clip to open its jaws.
- Attach the clip to the desired surface, such as a book cover, e-reader, tablet, or desk edge. Ensure the surface thickness does not exceed 1.2 inches for a secure grip.
- The soft padding inside the clip will protect your surfaces from scratches.
Operating Instructions
Power On/Off and Brightness Adjustment
- Locate the power button on the lamp head.
- Short press the power button to turn the light ON.
- Each subsequent short press will cycle through the 3 brightness levels (Low → Medium → High).
- To turn the light OFF, continue short pressing until the light turns off, or long press the button at any time.
Color Temperature Adjustment
- While the light is ON, long press the power button.
- The light will cycle through the 3 color temperatures (Cool Light → Daylight → Warm Light).
- Release the button when your desired color temperature is reached.
Adjusting the Gooseneck
The flexible metal gooseneck can be bent and twisted 360 degrees to position the light beam precisely where you need it. Adjust the angle and height to illuminate your reading material evenly and comfortably.

Image: The Monotremp Book Light provides comfortable illumination for shared reading moments.

Image: The focused beam of the Monotremp Book Light allows for private reading without disturbing a sleeping partner.
Maintenance
- Cleaning: Wipe the light with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use for extended periods, store the book light in a cool, dry place. It is recommended to charge the battery at least once every three months to maintain battery health.
- Battery Care: To prolong battery lifespan, avoid completely draining the battery frequently. Recharge the light when the brightness noticeably diminishes.
- Avoid Water: The Monotremp Book Light is not waterproof. Avoid exposure to water or high humidity.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not turn on. | Battery is depleted. | Charge the book light for at least 1.5 hours. |
| Light flickers or is dim. | Low battery. | Recharge the book light. |
| Light does not charge. | Charging cable or power source issue. | Ensure the USB cable is securely connected. Try a different USB cable or power source. |
| Clip does not hold securely. | Surface is too thick or too thin. | Ensure the surface is within the 1.2-inch maximum opening of the clip. Adjust position for better grip. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | Book Light |
| Model Number | MT538 |
| Dimensions (L×W×H) | 2.7"D x 1.3"W x 7.5"H (6.86 x 3.3 x 19.05 cm) |
| Item Weight | 1.3 oz (37 grams) |
| Light Source Type | LED |
| Number of Light Sources | 1 |
| Brightness | 70 Lumen |
| Color Temperatures | Cool Light, Daylight, Warm Light (3 modes) |
| Brightness Levels | 3 levels |
| Power Source | USB Rechargeable Battery (1 Lithium Ion battery included) |
| Runtime | 4 - 80 hours (depending on brightness setting) |
| Charging Time | Approx. 1.5 hours |
| Control Method | Push Button (Touch) |
| Gooseneck Material | Metal |
| Shade Material | Plastic |
| Is Cordless? | Yes |
| Water Resistance Level | Not Water Resistant |
| Average Life | 60,000 Hours |
Warranty & Support
Warranty Information
Monotremp offers a 2-year warranty for this book light. This warranty covers manufacturing defects and issues arising from normal use. Please retain your proof of purchase for warranty claims.
Customer Support
For any questions, concerns, or technical assistance regarding your Monotremp Book Light, please contact our customer support team. You can typically find contact information on the product packaging or through the retailer where you purchased the item. Please provide your model number (MT538) and a detailed description of the issue when contacting support.