1. Product Overview
The BAIHUAN RY004 USB Mug Warmer is designed to keep your beverages at a desired warm temperature. It features a constant temperature heating element, multiple temperature settings, and an automatic shut-off for safety and convenience. This device is suitable for various cup types and is ideal for use in offices, homes, or dormitories.


2. Safety Precautions
- This product is not a toy; keep away from children.
- Dry burning is prohibited. Always ensure a cup is placed on the warmer when in operation.
- Unplug the USB cable when not in use.
- Do not touch the heating panel directly to avoid burns.
- Due to the low power of the USB supply, this cup warmer is designed for heat preservation only and cannot boil water.
- Slight deformation or yellowing of the heating panel due to long-term high temperature is a normal phenomenon and will not affect the effect of use.
3. Setup
- Place the mug warmer on a flat, stable surface.
- Connect the USB cable to a compatible power source. This can be a USB wall adapter, a power bank, or a computer USB port.


4. Operating Instructions
- Power On: Once connected to a power source, the warmer is ready for use. The power indicator light will illuminate.
- Place Cup: Place your cup containing the beverage on the heating panel.
- Temperature Adjustment: The warmer offers 3 temperature settings. Touch the control area (usually indicated by a small circle or icon) to cycle through the temperature options:
- Level 1: Approximately 40-45°C
- Level 2: Approximately 46-50°C
- Level 3: Approximately 51-60°C
- Automatic Shut-off: For safety, the mug warmer will automatically shut off after 8 hours of continuous operation.
- Power Off: Remove the cup and unplug the USB cable when finished.



5. Maintenance
The mug warmer features a waterproof conductive glass design for easy cleaning.
- Always unplug the device before cleaning.
- Wipe the heating panel with a soft, damp cloth.
- For any spills, wipe dry immediately. The device can continue to be used after wiping dry.
- Do not immerse the device in water or any other liquid.

6. Troubleshooting
- Device not turning on: Ensure the USB cable is securely connected to a power source that provides at least 5V/2A and ≥10W.
- Beverage not heating: Verify that the cup is placed centrally on the heating panel and that the cup material has good thermal conductivity (e.g., stainless steel, ceramic, glass with a flat bottom).
- Water not boiling: This device is designed for heat preservation, not for boiling water. It will maintain the temperature of an already warm beverage or slowly warm a cool beverage, but it cannot bring cold water to a boil.
- Heating panel appears discolored or slightly deformed: This is a normal phenomenon due to long-term high temperature and does not affect the functionality or safety of the device.
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | RY004 |
| Brand Name | BAIHUAN |
| Input Power | USB 5V/2A, ≥10W |
| Temperature Settings | 3 levels (approx. 40-45°C, 46-50°C, 51-60°C) |
| Auto Shut-off | 8 hours |
| Material | Waterproof conductive glass, Aluminum alloy casing |
| Dimensions | 102mm (Diameter) x 7mm (Thickness) |
| Cable Length | 0.8 meters |
| Certification | CE |
| Package Dimensions | 15cm (L) x 14cm (W) x 5cm (H) |
| Package Weight | 0.116 kg |

8. User Tips
- For optimal heat preservation, use cups with good thermal conductivity and a flat bottom, such as those made of stainless steel, ceramic, or glass.
- Remember that this device is primarily for maintaining the warmth of your drink, not for heating cold liquids to high temperatures.
- If you need a longer reach for your power source, consider the version with the 1m OTG extension cable.
9. Warranty and Support
For any product-related inquiries, technical support, or warranty claims, please refer to the official user manual (PDF) or contact the seller directly. The user manual can be accessed here.

