This Mercury Security MR50-S3 Single Card Reader Interface Controller Board is a reliable and efficient unit for access control equipment. It is designed to work seamlessly with your existing system and provide secure and convenient entry for authorized personnel. With its unit quantity of one, this board is perfect for small to medium-sized businesses that require a single card reader interface controller. The model is made by Mercury, a well-known brand in the access control equipment industry. The country of origin is unknown, but the unit is of high quality and has been tested for maximum performance. This board is perfect for those who require a reliable and efficient access control system that is easy to use and maintain.