Experience the ultimate warmth and indulgence with the BUUO Control Smart Mug - the perfect coffee companion for your home or office. This double-sided mug with real-time temperature LED display and surround heating will keep your drink at the perfect temperature from first sip to last drop. As the epitome of delivering warmth through coffee cups, BUUO strives to be the world's premier coffee cup brand, delivering a luxurious and exclusive experience to coffee lovers everywhere. Explore our range of four sophisticated colors, each with an ergonomic design for easy carrying, and enjoy the deliciousness of your favorite coffee in style. To activate the power, press and hold the button for 1-2 seconds. The next three presses will switch between different temperature settings, while the fourth press will turn off the cup. Is it necessary to use the base for insulation? The cup has its own battery and can be detached from the base to function independently for heating before the battery runs out. Can it be charged when empty? Yes, it can be charged without liquid. However, if there is no liquid to heat, the display will show E1 and the heating function will automatically turn off after 10 seconds.