Function: 1 The heating speed is fast, so it heats up in 5 seconds and eventually reaches the temperature balance point. 2. Supports USB power, plug and play, low power consumption, suitable for home, office and dorm. 3 Heats evenly, suitable for most cups on the market, supports ceramics, glass cups, metal cups, etc. 4 The surface temperature of the heating sheet is up to 88 degrees Celsius, and the maximum temperature is about 90 degrees Celsius. 5 Increases heating area for larger cup shapes and fits seamlessly to the bottom of the cup Specifications: Condition: 100% Brand New Item Type: Coffee Warmer Material: ABS + Aluminum Voltage: 5V