Detailed description:Key Features:Drinking Water Reminder: This smart coffee mug warmer has the function to remind you to drink water regularly when you are busy, which helps you develop good living habits and be good for your health.Ideal for Coffee/Tea Lovers: Beautiful and compact design, keep the beverages warm all day long, it's a great gift for your family, friends and all your loved ones on Valentine's day, Thanksgiving and Christmas.Gravity Induction: The gravity-induction will turn the coffee mug warmer on and shut it off automatically. There is no need to control by yourself, which is very convenient and energy-saving.Specifications:Product Name: Coffee Mug WarmerMaterial: ABS + GlassRated power: 10WSize: 132x118x20mmNet weight: 140gVoltage: 5V = 2APower supply method: USBThe panel temperature is about: 70 C, 90 C, 110 C (It does not refer to the temperature of the heated object.)Note1. It's just a coaster, no cup, thank you!2. The outside of the heating ring will also have a certain temperature affected by heat conduction. Please do not touch the black plate surface after turning it on or turning it off for a period of time. Parts List:1 X Coffee Warmer Coaster1 X USB Cable1 X User Manual