Features: The 8 Channel Quiz Board features priority based answering with automatic lock in function, displaying responder number through a digital tube while triggering alerts via built in buzzer for clear competition results. This complete set integrates CD4511 chip and timer circuitry, offering reset functionality (S09 button) for sequential quiz rounds. Designed for electronics students and competition organizers seeking hands on digital circuit training tools for skill development and interactive learning. Ideal for classroom demonstration, vocational school troubleshooting drills and practical applications of circuits in competitive scenarios. Combines theoretical learning with practical assembly, featuring through hole components for soldering practice and world implementation of number locking mechanisms in quiz design. Specifications: Component:Metal Size:Approx.65x55mm/2.56x2.17inch Package Includes: 1Pc Responder Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.