Emphasize: 1. The product only includes the heating coaster, and other experimental accessories are not included in the picture. 2. It can only keep warm water; water can't boil. 3. This product only comes with a USB cable, excluding a plug. 4. Be sure to use a DC5V/2A power plug, the insulation effect will be affected. Features: 1. It is made of high-quality plastic materials, safe, non-toxic, tasteless, and hygienic. 2. It can be used to heat milk, tea, coffee, etc. 3. Lightweight, easy to carry, and won't take up too much space. 4. It can be used repeatedly, is durable, and is long-term. 5. Third gear temperature regulation. 6. Suitable for schools, dormitories, and offices, easy to use coasters. Specifications: Product name: USB heating coaster Material: aluminum alloy tempered glass Size: 7 * 102 mm Voltage: DC 5V/2A Power: 8-10W Switches: connecting switches Safety protection: automatic shutdown after working for 8 hours Operating instructions: heating gear 3. 1. The first time you touch the switch to raise the gear, the red indicator light will be on 2. Touch the switch again to open the middle gear, and the blue indicator light will light up 3. Touch the switch to start the low gear for the third time, and it will light up the green indicator light Packing list: Heating pad x1pc