FOR YOUR ATTENTION: Dear customers, please note that as a beverage warmer instead of a hot plate with much higher power, our product is absolutely capable of keeping your beverage warm enough for drinking as long as the working condition is correct (cups can have a good contact with warm surface). However, if you expect it could work as a hot plate that can make your coffee very hot in minuets, we are deeply sorry to say this is not what a mug warmer made for. Meanwhile, this Cosori warmer is totally different from the cheap one! To make sure your Safety USE to the largest extent, we equipped with a thicker power adapter to make the power supply voltage only 12v rather than 120V. For a better insight into our product: PI Heating Film (Stable, evenly heating and low electromagnetic radiation) VS Cheap traditional heat coil; Aluminium Alloy material VS Polycarbonate; Fine workmanship VS Rough one; All in all, if you are looking for a quality beverage warmer, Cosori would be definitely the perfect choice! AC AdapterInput AC 100-240V, 50-60HzOutput 12V, 3A WarmerInput DC 12V, 3ATemperature Range 77°-230°F (25°-110°C)