Stress test card

Matrial:PVC+Liquid ink display

Instruction:

Simply hold your thumb on the Stress Control Card indicator for about 10 seconds, until it changes color.And Following below,you know what you need do....

Blue - you're calm
Green - you're normal
Red - you're tense
Black - you need a vacation!

---Any shape is available!

---You design is available,and you logo and so on.