☕ Maintain Optimal Temperature: This mug warmer can slow down the cooling speed of your hot coffee and keep your coffee at about 131℉ (55℃). It keeps ideal drinking temperature whole day, which is neither too hot nor too cold, so you can sip your coffee at any time, without waiting. ☕ Safe & Reliable : Thanks to the microgravity technology, this mug warmer can shut off/on automatically. Just putting your mug on, the coffee warmer will work, and taking the mug away, the warmer will be off automatically.The Weight of your mug needs to be over 0.8lbs (13oz) to activate the gravity induction switch. ☕ Suitable for Most Cups: The warming pad fits for most cups, such as glass cup, stainless steel cup, ceramic cup etc. For better results, we recommend using flat bottom glass cup or stainless steel cup. Placing a lid over the mug will also help retain heat.  Waterproof design: the warming pad was covered with a layer of thermal conductive glass without need for security concern for occasional spill and it is easy to clean, safe and reliable.