Feature: Lightweight and small, easy to place and store, easy to carry. The USB vacuum flask is easy to use, just connect it to a device that supports USB. Safe and reliable, equipped with high quality heating elements and USB power supply. Retro dashboard design, simple operation. Suitable for home and office. Keep the glass of water, tea, coffee, milk or other drinks warm. Appointment heating, timing start, humanized, intelligent, more convenient and practical . Specification: Product size: 180 x 90 x 20mm/7.08x3.54x0.78'' Product color: dark green, mint green, pink Product weight: 186g Rated voltage: DC5V Input current: 2.1A (min) Rated power: 10W (min) Power supply mode: USB plug-in Function: 5-mode temperature adjustment, drink water reminder Package Included: 1 x Mug Warmer It is very suitable for winter use. Keep the cup warm in cold weather, non-slip, heat-insulating, placemat.Lightweight and small, easy to place and store, easy to carry. The USB vacuum flask is easy to use, just need to connect it to a device that supports USB. Safe and reliable, equipped with high quality heating elements and USB power supply. Retro dashboard design, simple operation. No driver, hot swapping. Knob button, turn smoothly, easy to choose the temperature that suits you. It can maintain the temperature of coffee, tea, drinks at around 50C. Suitable for home and office. Keep the glass of water, tea, coffee, milk or other drinks warm. Appointment heating, timed start, humanized, intelligent, more convenient and practical. Three heating levels are reserved: 2 h, 5 h, 8 h; the regular third stop ratio is 2 o'clock, 4 o'clock, 6 o'clock.