Frequently Asked Questions
Product Questions
How does the USB coffee mug warmer work?
Our USB mug warmers plug into any USB port — your laptop, desktop, or USB wall adapter — and maintain your drink at a comfortable temperature using a built-in heating plate.
What temperature does the warmer maintain?
Our warmers maintain a temperature between 40°C–55°C (104°F–140°F), perfect for keeping your coffee, tea, or cocoa warm without overheating.
Is it safe to leave the warmer on all day?
Yes! Our warmers are designed for extended use and include an automatic overheat protection feature for peace of mind.
What mugs are compatible?
Our warmers work with most standard ceramic, glass, and stainless steel mugs. We recommend using mugs with a flat bottom for best contact and performance.
Shipping & Delivery
How long does shipping take?
Standard shipping typically takes 5–7 business days within the US. Expedited options are available at checkout.
Do you ship internationally?
Yes, we ship to select international destinations. Shipping times and costs vary by location and will be calculated at checkout.
Returns & Warranty
What is your return policy?
We offer a 7-days hassle-free return policy. If you're not completely satisfied, contact us and we'll make it right.
Is there a warranty on the product?
Yes, all Rovilas products come with a 12-month manufacturer's warranty against defects in materials and workmanship.
Still have questions?
Feel free to contact us and our team will be happy to help!