1. Lie Detector is a really fun toy to play with your friends, especially for truth party game. Tricky Toys for your friends, Fool's Day Party, Prank gifts, Halloween Prank, Christmas gift. 2. Put tester's fingers on the sensing slots of the lie detector, it will punish the liar when his heartbeat speeds up. 3. The polygraph has two kinds of punishment functions: Electric Shock or Vibration. The lie you say bigger, more lights on. When all 5 lights on, you will be punished heavily by electric shock.If you tell the truth, no shocking and you can move out your hand safely. But if you tell a lie, you will be shocked by electric. 4. Polygraph Test is made of high quality ABS material, durable in use. 5. Powered by 3 x AA batteries (Not included), easy to use.It would be a great warm-up game at a party.