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Single warming coffee mug, black stainless steel mug with lid and heated coaster base
Warming coaster control panel with LED temperature settings and indicator lights
Warming coffee mug on heated coaster with lid and side handle on tabletop
Warming coffee mug system with lid, temperature LED display, coaster, and power switch
Warming coffee mug on coaster with assorted hot drink examples in the cup
Warming coffee mug and coaster heating on a tabletop beside a sofa
Black warming coffee mug with lid and handle, shown with coaster size measurements
Single warming coffee mug, black stainless steel mug with lid and heated coaster base
Warming coaster control panel with LED temperature settings and indicator lights
Warming coffee mug on heated coaster with lid and side handle on tabletop
Warming coffee mug system with lid, temperature LED display, coaster, and power switch
Warming coffee mug on coaster with assorted hot drink examples in the cup
Warming coffee mug and coaster heating on a tabletop beside a sofa
Black warming coffee mug with lid and handle, shown with coaster size measurements

Mainstays Warming Coffee Mug, 12 oz Stainless Steel Coffee Mug with Mug Warmer Coaster and Lid

$39.50 $42.00( / )
Shipping Free.
Key item features Adjustable Warming: Offers three temperature settings (135, 140, or 145 F) to customize beverage warmth. Extended Heating: Features a built-in rechargeable battery for up to 2 hours of portable warming, or continuous heating with the charging coaster. Safety Features: Includes an auto-shutoff function after 3 hours on...
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Key item features


  • Adjustable Warming: Offers three temperature settings (135, 140, or 145 F) to customize beverage warmth.
  • Extended Heating: Features a built-in rechargeable battery for up to 2 hours of portable warming, or continuous heating with the charging coaster.
  • Safety Features: Includes an auto-shutoff function after 3 hours on the coaster or when the mug is empty.
  • Practical Design: Comes with an anti-spill lid to prevent messes and is suitable for various hot beverages like coffee, tea, and hot chocolate.
  • Durable Construction: Made from stainless steel, the 12 oz mug is handwash safe for easy cleaning.
  • Complete Set: The product package includes the warming mug, a charging coaster, a lid, and a power adapter.
  • Technical Specifications: Operates with an input of 12V/1.5A, power of 18W, and a battery capacity of 7.4V/2000mAh.

🚚 Free Shipping & 30-Day Free Returns

Enjoy Free Standard Shipping across the USA and 100% Free 30-Day Returns with zero restocking fees.

📦 Shipping Policy

  • Target Destination: We ship exclusively to physical addresses within the 50 United States.

  • Order Processing (Handling Time): 0 to 3 business days (Mon – Fri). Orders placed after 5:00 PM ET or on weekends begin processing the next business day.

  • Transit Time: 0 to 3 business days (Mon – Fri).

  • Total Estimated Delivery: 1 to 6 business days.

  • Tracking: A tracking number will be emailed to you as soon as your order ships.

🔄 Return & Refund Policy

  • 30-Day Return Window: Items can be returned within 30 days of delivery.

  • 100% Free Returns: We provide a prepaid return shipping label for all eligible returns (including customer remorse, wrong size, or defective items).

  • Zero Restocking Fees: We do not charge any restocking or return fees.

  • Item Condition: Must be new, unused, and in original packaging with all accessories included.

  • Fast Refunds: Once inspected at our warehouse, your full refund is processed back to your original payment method within 7 business days.

⚠️ Damaged or Incorrect Orders?

If your item arrives damaged, defective, or incorrect, please notify us within 48 hours of delivery with photos of the item and packaging so we can expedite a free replacement or instant full refund.

📩 How to Start a Return or Inquiry

Returns are accepted by mail with prior authorization. Contact our customer care team with your order number: