Package Includes: 1 x Micro Polygraph, Requires 3 "AA" batteries (not included)Place your hand on the shocked liar's hand plate, press the "reset" button, hold your hand still, and then press the "analyzer" button. The machine willmonitortheperson'svitalsigns as a point of comparison during interrogation. If you tell the truth, you won't get shocked and you can safely remove your hands. But if you lie, you will get electric shocks. There are 5 LED lights in total, 3 green lights and 2 red lights. The bigger the lie you tell, the more the light turns on. When all 5 lights are on, you will receive a heavy penalty, electric shock or vibration. The portable lie detector is a tabletop device; can be used as a toy for friends, April Fools' Day party, gag gift, Halloween prank, Christmas gift. This is a good choice and the best gift for friendsWarm reminder: This is not a professional polygraph tool, so it does not have the accuracy of a polygraph, but it is still a very fun toy to play with friends and family!