YM0164X Puts your hand on the instrument and the polygraph will detect your palm’s temperature to determine whether you are lying or not. Equipped with 5 LED lights With the increase of lying degree the LED lights will be lighted up one by one The polygraph will not emit radio when all the 5 LED lights on Adds a playful touch to your parties Package Details Weight: 364.87 g Size: 16*9*16 cm Package Includes * Polygraph