The Global Specialties PB-501 Portable Logic Design Trainer is a low cost portable trainer, which is capable of satisfying many requirements arising in the design and study of digital logic circuitry. The PB-501 can be powered-up via batteries, optional wall-mount power adapter, or by an external 5V power supply. The PB-501 can be utilized for the design and study of gates, counters, multiplexers and can even interface directly to a microprocessor. Utilizing the PB-501, students will learn valuable hands-on breadboarding techniques and build a solid foundation in digital logic circuit experimentation, construction and analysis. Housed in a tough molded plastic carrying case with an integral hinged cover, the PB-501 stacks conveniently for storage.