DIY Assembly Physical Kits: Electric Lie Detector Come with unassembled parts and instruction: assemble the experiment by yourself Working theory: Discover who's telling the truth and who's lying by measuring a person's physiological changes, such as blood pressure, pulse, breathing, and skin . An interesting liar detector game. It would be a great warm-up game at a party. Trains children's hands & eyes coordination, fine motor skills, stimulate observation & thinking abilities Great & interesting physical educational toy, also good for parent-child interactive game Material: Plastic Specification: Assembled Size: Approx 15 x 12 x 4 cm / 5.91 x 4.72 x 1.57 inch Package Includes: 1 DIY Electric Lie Detector Kit (Includes Chinese Manual)