USB Heating Coaster Mug Warmer, 3 Heat Levels

Your coffee stays warm from the first sip to the last.

This USB heating coaster has three temperature settings: 131°F, 149°F, and 167°F (55°C, 65°C, and 75°C). These are the warmer's settings; your drink's temperature varies with the cup, amount of liquid, and room conditions. Three heat levels let you match the warmth to your drink, cup, and room. One-touch start keeps it simple, and USB power means you can run it from a laptop, desktop, power bank, or USB wall adapter.

Why we picked it

• Keeps drinks warm longer - Steady heat cuts down on trips to the microwave.
• Three levels, USB power - Dial in the warmth and plug into whatever's nearby.
• Compact and steady - An anti-slip surface holds your cup in place.

Good to know

It measures about 4.53 x 4.53 inches (11.5 x 11.5 cm) with a low-profile height, so it fits on a crowded desk, nightstand, or counter. It warms suitable containers like ceramic mugs, glass cups, and some metal cups. It's a warmer, not a kettle, so it won't boil liquids. Keep the surface dry, don't cover the heating area, and unplug it when you're done.

Common questions

Q: Which cups work best?
A: Flat-bottomed ceramic, glass, and some metal mugs transfer heat well. Thick or insulated cups warm more slowly.

Q: Does it boil liquids?
A: No. It keeps drinks warm or gently reheats them; it doesn't boil water or cook.

Q: How is it powered?
A: Over USB from a laptop, desktop, power bank, or USB wall adapter that supplies the needed current.

Q: Can I leave a drink on it for a while?
A: It's made for daily use. Keep the surface dry, don't cover the heating area, and unplug when not in use.