Specification: 1.Size: 16X12cm 2.Material: Tempered Glass. 3.Color: White or Green. 4.Powered by : USB 5.Power: 16W. 6.Voltage: 5V. 1. Built in gravity switch control and LED indicator light, automatically heating, you just need to put cup on and wait to enjoy. 2. Built in thermostat for keeping your beverages at the perfect temperature from the first sip to the last drop(55/131). 3. Efficient concentrated heater ensures being evenly warmed in minutes, keep the best temperature for taste. 4. The maximum of continual working for 8hrs and automatically power off for preventing overheating, safe and reliable. 5. 16W low power consumption, energy saving even for long time use. 6. With 4 anti-slipped pads to be steadily put on desk and table. 7. Durable smooth tempered glass surface, easy to use and clean. 8. Suitable for ceramics, glass, stainless steel and other heat resistant containers. Package Included: 1* Cup Heater