Do your friends always speak the truth? Find out with this portable “Truth Detector”. Powered by a 9V battery, the LED band glows red when it detects increased stress levels in one’s voice. SmartHome has this product in stock for $39.99.
“Two of the most effective indicators are the Psychological Stress Evaluator (PSE) and the Voice Stress Analyzer (VSA). These tests have been imported into the Truth Detector, a specially designed device that analyzes and measures the frequency changes that occur in the voice when a person undergoes stress. ”