[Auto Shut Off] This mug warmer for desk comes with automatically shut off design. Which can prevent the safety hazards caused by forgetting to close with the coffee warmer. It is an Perfect for extended work sessions, immersive reading marathons [Keep Beverages Warm] - The cup warmer mainly keep your coffee, water, milk, tea, and other beverages at the perfect temperature for a long time, wherever and whenever, you can enjoy your favorite drinks at the perfect but not-too-hot temperature. [Use Suitable Mug] - Use a thin-walled, flat-bottomed mug will have the best warmth retaining performance [Best Gift Choice] - Beautiful and compact design, keep your beverages always warm, It will be your best gift choice to show your care to your families, lover or friends on 's day, Thanksgiving, Christmas or other special occasions to show your cares. 5V voltage safe power supply can be connected to mobile power supply, laptop, convenient for outdoor use 1. The product is just a coaster, not a cup. 2. The temperature at the center of the panel is approximately 70C, 90C, and 110C. This temperature does not the temperature that the heated object can reach - (the panel temperature and the temperature of the heated object vary depending on the ambient temperature) 3. The indicator light flashes back and forth, like a marquee: the plug current is not enough, use a 5V-2A plug 4. Three flashes at the same time: 1. There is a cup on the coaster, which is a problem with the gravity switch. 2. There is no cup on the coaster, you need to put a cup on it. Automatic power off situation: 1. Pick up the cup and stop heating 2. If the cup is not placed for 5 minutes, the power will be cut off. 3. Place the cup after 5 minutes and you need to turn the switch back on to heat. Rated power:10WNet weight:140g Input:5V-2A Colour:Black Material:ABS Size:132x118x20mm Package Contents: 1 * USB Heating Cup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.