The weather is getting colder, and Christmas cards need to be kept warm too!
 Through the temperature of your hands, you can see the message written by the sender.
 This is definitely the warmest Christmas card this Christmas!
 "Write something and put on a temperature-sensing sticker to hide the message, and then reveal it through the temperature of your hands!"
 There are four options to choose from: A) Christmas tree B) Christmas deer C) Christmas stick D) Christmas pop
 Each Christmas card comes with a color-changing sticker and an envelope.
 Thick, tactile paper with a gold-tone design.
 After writing the message with a small red pen,
 Use the included color-changing sticker to cover the words.
 Note: The color-changing temperature of the sticker is about 32 degrees. If the ambient temperature is too high or too low, the color-changing effect will be affected. (If the outdoor temperature is too low, you can also use a hand warmer/match to reveal the hidden information)
 Note: Different thickness or color pens may affect the sticker's concealing effect, please be aware.
 *The effect can be used repeatedly.