Introduction
Thank you for choosing the AFDEAL Rst-77 USB Thermostatic Heating Coaster. This device is designed to keep your beverages at an ideal warm temperature, ensuring your coffee, tea, milk, or hot chocolate remains enjoyable for longer. Featuring three precise temperature settings, touch controls, and an automatic shut-off function, it offers convenience and safety for both office and home use.
Safety Information
Please read and understand all safety instructions before using this product. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- This product is a thermostatic cup pad designed solely to maintain the temperature of pre-heated beverages. It cannot heat cold drinks to a warm temperature.
- Do not immerse the device in water or any other liquid.
- Keep the device away from children and pets.
- Use the device on a stable, flat, and heat-resistant surface.
- Ensure the USB power source provides the recommended 5V 2A input to prevent damage or malfunction.
- Do not touch the heating surface immediately after use, as it may be hot. Allow it to cool down before handling.
- Unplug the device when not in use or before cleaning.
- Do not operate the device if it has a damaged cord or plug, or if it malfunctions or has been damaged in any manner.
- The device features four anti-slip foot pads to keep cups firmly in place for safer use.
Package Contents
Please check the box for the following items:
- 1 x AFDEAL Rst-77 Warming Cup Pad
- 1 x 119.5cm USB Cable
- 1 x Color Box
Specifications
| Feature | Detail |
|---|---|
| Product Model | Rst-77 |
| Material | ABS, Micro-Crystalline Glass Panel |
| Color | Grey |
| Input Voltage/Current | 5V 2A |
| Rated Power | 10 W |
| Temperature Settings | 3 levels: 55°C (131°F), 65°C (149°F), 85°C (185°F) |
| Automatic Shut-off | 8 hours |
| Dimensions (L x W x H) | Approx. 13cm x 11.7cm x 2.5cm (5.12in x 4.61in x 0.98in) |
| Certifications | CE, FCC, RoHS |
Setup
- **Unpack:** Carefully remove the warming cup pad and USB cable from its packaging.
- **Placement:** Place the warming cup pad on a flat, stable, and heat-resistant surface, ensuring there is adequate ventilation around the device.
- **Connect to Power:** Connect the provided USB cable to the warming cup pad's USB port. Then, connect the other end of the USB cable to a compatible power source such as a computer, a charger adapter, or a power bank. A 5V 2A power source is recommended for optimal performance.
Operating Instructions
- **Power On:** Once connected to a power source, the device is in standby mode. Lightly touch the power button (usually indicated by a power symbol) to turn on the warming function.
- **Place the Cup:** Place your flat-bottomed cup, pot, or bowl containing your pre-heated beverage directly in the center of the micro-crystalline glass panel. Ensure the container has a flat bottom for efficient heat transfer.
- **Select Temperature:** Lightly touch the temperature selection button (often indicated by wavy lines or temperature symbols) to cycle through the three available temperature settings:
- Low: 55°C (131°F)
- Medium: 65°C (149°F)
- High: 85°C (185°F)
- **Drink Water Reminder:** The device includes a 1-hour drink water beep reminder. Press the dedicated reminder button (often indicated by a cup and water droplet symbol) to activate this feature. A prompt tone will be emitted every hour to remind you to hydrate.
- **Automatic Shut-off:** For safety and energy saving, the warming cup pad will automatically shut off after 8 hours of continuous operation.
- **Power Off:** To turn off the device manually, lightly touch the power button again.
Maintenance
- **Cleaning:** Ensure the device is unplugged and completely cool before cleaning. Wipe the surface with a soft, damp cloth. Do not use abrasive cleaners, solvents, or immerse the device in water.
- **Storage:** When not in use for an extended period, unplug the device and store it in a cool, dry place away from direct sunlight and moisture.
- **Care:** Avoid dropping the device or subjecting it to strong impacts, as this may damage the internal components or the micro-crystalline glass panel.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Not properly connected to power, or power source is insufficient. | Ensure the USB cable is securely connected to both the device and a working 5V 2A power source. Try a different USB port or adapter. |
| Beverage is not warming. | Cup is not flat-bottomed, beverage was cold to begin with, or device is in standby mode. | Use only flat-bottomed cups for optimal heat transfer. Remember, this device maintains warmth, it does not heat cold liquids. Ensure the device is powered on and a temperature setting is selected. |
| Device automatically shut off. | 8-hour automatic shut-off activated. | This is a safety feature. You can turn the device back on by pressing the power button. |
| Drink reminder not beeping. | Reminder feature not activated. | Press the dedicated reminder button to activate the 1-hour audible alert. |
User Tips
- For the best warming results, always use flat-bottomed mugs or containers that make full contact with the heating surface.
- Ensure your USB power source provides at least 5V 2A for efficient and consistent heating. Lower power sources may result in reduced performance.
- Utilize the 1-hour drink reminder feature to help maintain consistent hydration throughout your day.
- Pre-heat your beverage before placing it on the coaster for optimal temperature maintenance.
Warranty and Support
AFDEAL products are manufactured to high-quality standards. If you encounter any issues with your Rst-77 USB Thermostatic Heating Coaster, please refer to the troubleshooting section first. If the problem persists, contact the seller or manufacturer for assistance. Please have your product model (Rst-77) and purchase information ready when contacting support.





