sell biofeedback card

biofeedback card Stress biofeedback card, we also call stress control card, mood card or lover card. Usage: Hold your thumb onto the Stress Control Card indicator for about 15 seconds, until it changes color. Blue - you\'re calm, Green - you\'re normal Red - you\'re tense, Black - you need a vacation! Detail: It can be designed by Regular credit card size or other shape, it is made as durable plastic temperature indicator. A liquid crystal square changes color as it is warmed by the finger, indicating Stressed, Tense, Normal or Calm.