1. Introduction
Thank you for choosing the OCOOPA UT5 Duoheat Rechargeable Dual-Sided Hand Warmers. This device is designed to provide instant and consistent warmth for your hands in cold environments. Featuring dual-sided heating, three adjustable temperature levels, and a portable design, the UT5 Duoheat is suitable for various outdoor activities and daily use. Please read this manual thoroughly before use to ensure proper operation and safety.
2. Safety Information
To ensure safe operation and prevent damage, please observe the following safety guidelines:
- This product features UL-certified batteries (E535516) and is designed with protection against overheating and overcharging.
- Do not expose the device to extreme temperatures (above 140°F / 60°C) or direct sunlight for extended periods.
- Avoid dropping, disassembling, or modifying the device. This may cause malfunction or safety hazards.
- Keep the device away from water and other liquids. Do not use if wet.
- Do not insert foreign objects into any openings.
- Store in a cool, dry place when not in use.
- Keep out of reach of children.
3. Package Contents
Verify that all items are present in your package:
- OCOOPA UT5 Duoheat Hand Warmer (x2)
- USB-C Charging Cable (x1)
- User Manual (this document)

Image: Contents of the OCOOPA UT5 Duoheat package, including two hand warmers, a USB-C charging cable, and the user manual.
4. Product Overview

Image: A pair of OCOOPA UT5 Duoheat hand warmers, showcasing their compact design and heating surfaces.
Key Features:
- Dual-Sided Heating: Provides warmth on both surfaces for comprehensive hand coverage.
- Rapid Heating: Heats up in approximately 3 seconds.
- Three Heat Levels: Adjustable temperature settings from 98°F to 125°F (37°C to 52°C).
- Long Battery Life: Up to 8 hours of warmth on a single charge (single-sided, lowest setting).
- LED Indicators: Clearly display battery level and current heat setting.
- Compact and Portable: Lightweight (2.36 oz) and slim (0.6 inches thick) design for easy carrying.
5. Setup and Charging
Initial Charge:
Before first use, fully charge both hand warmers. Connect the provided USB-C charging cable to a power source (e.g., USB wall adapter, computer USB port) and to the charging port on each hand warmer. The charging time is approximately 3.5 hours for a full charge.
Charging Indicators:
The blue LED lights indicate the battery level during charging. When all blue LEDs are solid, the device is fully charged.
6. Operating Instructions
Power On/Off:
Press and hold the power button for 3 seconds to turn the hand warmer on or off.
Adjusting Heat Levels:
Once powered on, short press the power button to cycle through the three heat levels:
- Level 1 (Gentle): Indicated by one red LED. Approximately 98°F (37°C).
- Level 2 (Medium): Indicated by two red LEDs. Approximately 116°F (47°C).
- Level 3 (Maximum): Indicated by three red LEDs. Approximately 125°F (52°C).

Image: Close-up of the OCOOPA UT5 Duoheat hand warmer showing blue LEDs for battery level and red LEDs for heat mode.
Dual-Sided Heating:
The UT5 Duoheat provides warmth on both sides simultaneously for maximum comfort. The heating elements activate quickly upon power-on.

Image: Diagram illustrating the dual-sided heating capability of the OCOOPA UT5 Duoheat, showing heat distribution across both surfaces.
Battery Level Indicator:
The blue LEDs indicate the remaining battery charge. The number of lit LEDs corresponds to the battery level.
Usage Duration:
The operating time varies based on the selected heat level and whether single or dual-sided heating is active. Refer to the table below for approximate durations:
| Heating Mode | Temperature | Approximate Duration |
|---|---|---|
| Single-sided | 98°F (37°C) | 8 hours |
| Single-sided | 116°F (47°C) | 6 hours |
| Single-sided | 125°F (52°C) | 4 hours |
| Dual-sided | 98°F (37°C) | 5 hours |
| Dual-sided | 116°F (47°C) | 4 hours |
| Dual-sided | 125°F (52°C) | 3 hours |

Image: Visual representation of UL certification and a chart detailing heating durations for single-sided and dual-sided modes at different temperature levels.
Portability:
The compact and lightweight design allows the hand warmers to be easily carried in pockets, bags, or gloves, making them ideal for various activities.

Image: Demonstrates the compact size of the OCOOPA UT5 Duoheat hand warmer, showing it fitting into a coat pocket and a small handbag.
Application Scenarios:
The OCOOPA UT5 Duoheat is suitable for a wide range of activities where hand warmth is desired, including:
- Outdoor recreation: Camping, hiking, fishing, hunting, skiing.
- Daily use: Commuting, working outdoors, attending sporting events.

Image: Collage showing the OCOOPA UT5 Duoheat hand warmer being used in different settings, such as fishing, working at a desk, and during commuting.
7. Maintenance
- Cleaning: Wipe the surface of the hand warmer with a soft, dry cloth. Do not use abrasive cleaners or immerse in water.
- Storage: When not in use for an extended period, store the hand warmer in a cool, dry place. It is recommended to charge the device at least once every three months to maintain battery health.
- Battery Care: Avoid fully discharging the battery frequently, as this can reduce its lifespan.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Hand warmer does not turn on. | Battery is depleted. | Charge the device fully. |
| Hand warmer does not heat up. | Device is not powered on or heat level is not selected. | Press and hold the power button to turn on, then short press to select a heat level. |
| Device is not charging. | Cable or power source issue. | Ensure the USB-C cable is securely connected. Try a different USB port or power adapter. |
| Heat is inconsistent or too low. | Low battery or incorrect heat setting. | Recharge the device. Adjust to a higher heat level. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Name | UT5 Duoheat (UT3057-BK) |
| Brand | OCOOPA |
| Material | Aluminum |
| Battery Type | Lithium-Polymer |
| Battery Capacity | 2500 mAh (per hand warmer) |
| Charging Time | Approximately 3.5 hours |
| Lower Temperature Rating | 98°F (37°C) |
| Upper Temperature Rating | 125°F (52°C) |
| Item Weight | 2.36 Ounces (per hand warmer) |
| Item Dimensions (LxWxH) | 1.91 x 0.62 x 3.41 inches (per hand warmer) |
| Reusability | Rechargeable |
| Certifications | UL Certified (E535516) |
10. Warranty and Support
The OCOOPA UT5 Duoheat Hand Warmers come with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and issues arising from normal use.
For warranty claims, technical support, or any questions regarding your product, please contact OCOOPA customer service. Refer to the contact information provided on the product packaging or the official OCOOPA website for the most up-to-date support details.
Please retain your proof of purchase for warranty validation.





