Warm coaster USB insulation heating pad warm milk PU leather surface high temperature heater office constant temperature coaster Keep your water glass, tea, coffee, milk or other beverages warm. Equipped with an on/off button, the easy-to-use USB cup warmer simply connects to a USB-enabled device. Safe and reliable, featuring a premium heating element and USB power supply. Ideal workplace gift or desk accessory. Perfect for winter use, keep your mug warm in cold weather. Powered by Laptop/PC/Power Bank/USB Charger/Wall Charger with USB Port illustrate: Lightweight and portable, easy to carry and carry around. Specification: material: plastic Size: 108x105x16mm Color: blue, black, black+white, blue+white, orange Package Included: 1 x coaster warmer