Smart Insulation COA-STER Coffee Cup Mat Heating Cup Pad Office Features: 1. It is very suitable for winter use. Keep the cup warm in cold weather, non-slip, heat insulation, placemat. 2. Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away. 3. The easy-to-use USB vacuum flask, just connect to a device that supports USB. Safe and reliable, equipped with heating elements and USB power supply. 4. Safe material: The product is made of tempered glass panel, which is safe and environmentally friendly, and children can use it with confidence. 5. No driver, hot swap. It can keep the temperature of coffee, tea, beverage at about 50°C. 6.Use ordinary AC power, suitable for home and office. Keep the glass of water, tea, coffee, milk or other beverages warm. Specifications: Color: AR-MY- green, green, (optional) Material: Tempered glass panel Size: 180 x 90 x 20mm Rated voltage: 5V Input: 5V = 2.1A (MIN) Rated power: 10W Package Included: 1 x COA-STER Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real. Smart Insulation Coa-ster Coffee Cup Mat Heating Cup Pad Office Professional design, comfortable, durable You can use it longer,High cost performance This is a good gift for your friends, family and classmates.It's a good choice Water Bottle With Straw Water Bottles For School Water Bottles Kids Water Bottle With Handle Water Bottle With Strap Water Bottle Stickers Hydro Flask Water Bottles Water Bottle Holder With Strap Water Bottle With Filter Vacuum Insulated Mug With Handle Vacuum Insulated Travel Mug Vacuum Insulated Coffee Mug Luxe Vacuum-Insulated Stainless Steel Thermal Travel Mug Stainless Vacuum Insulated Coffee Cup Travel Mug