I think I know the answer but can you use an ordinary coffee cup on the warmer?

Absolutely Yes! Most coffee mugs have a concave bottom which keeps the heating element from making contact with the bottom of the coffee mug. This limits the usefulness of most coffee cup warmers. However, this warmer can be set warm enough to keep even those cups and their contents warm (hot). However, I found a few silicone coffee cups "hats" that help keep the coffee warm too. Together, my coffee stays hot as long as I want it to. Personally, I use the flat bottomed steel cup and even without the lid, it stays warm to hot as long as I want.

What is the hottest temperature in reality? Can someone tell me if it is still steaming hot?

I think the warming plate gets up to about 180F per the readout. Whatever the temperature actually is my tea stays very hot. Not hot enough to burn my lips or mouth, but hot enough to feel freshly made. If I leave it on the warming plate for a while when there is only about half and inch of beverage left it does get a little too hot to drink comfortably though, but that’s to be expected. I bet if I turned the temp down when I’m nearing the end of my tea it would be just fine.

Is the mug dishwasher safe?

To prolong the mug's lifespan, we recommend not to wash it by dishwasher. Hope this helps! If any further question you have, feel free to contact us through Amazon Message.

Is this wireless? I see some pictures with a cord and others without.

It takes a lot of electric power to heat surfaces. A cordless warmer of this size would have a dead battery in less than a half hour. This is a corded appliance that you need to plug into a 120V (or 110V) outlet. Be happy about that. It keep your coffee warm all day.

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☕ Stay warm, stay winning — sip smarter with COSORI!

RAPID 24 W WARMING - No more lukewarm coffee—24 watts deliver fast, consistent heat.
AUTO SHUTOFF SAFETY - Smart auto shutoff protects your drink and your peace of mind.
PRECISION HEAT CONTROL - Keep your brew at the perfect sip-ready temp with ±1°F accuracy.
PREMIUM STAINLESS STEEL MUG - Durable 304 food-grade steel with a comfy heat-resistant handle for stylish, safe sipping.
CUSTOMIZABLE TEMPERATURE SETTINGS - Switch easily between °F and °C to match your global lifestyle.

The COSORI Coffee Mug Warmer & Mug Set combines a powerful 24W electric warmer with a premium 17oz 304 food-grade stainless steel mug. Featuring precise temperature control within 1 degree, customizable °F/°C settings, and an auto shutoff for safety, it’s designed to keep your beverage perfectly hot while fitting seamlessly into your modern, fast-paced lifestyle.

Item weight	17 Ounces
Capacity	500 Millilitres
Number of trays	1
Voltage	240 Volts
Wattage	24 watts
Maximum temperature	230 Degrees Fahrenheit
Lower temperature rating	77 Degrees Fahrenheit
Upper temperature rating	194 Degrees Fahrenheit
UPC	817915023846
Global Trade Identification Number	00817915023846
Manufacturer	COSORI
Model Number	HTHOHASA07DC
Product Dimensions	13.72 x 1.78 x 10.92 cm; 481.94 g
Auto Shutoff	Yes
Special Features	Programmable
Item Weight	481 g

COSORI Coffee Mug Warmer & Mug Set,Electric 24Watt Beverage Cup

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