Detailed Product Description Usage: 1: placed in the hands of the product, according to the bottom of the white middle of a switch you can light up the cup, and 2: Turn off the power supply is the same way, the middle part of the low-end products are generally bright people will use this also, but more described. Dimensions : high 5.5cm diameter, 5.0cm (there are about 0.2cm error) Material : ...