SCR333 Internal Smart Card Reader: The SCR333 is based on SCM Microsystems' STC II micro controller. It leverages and shares all the SCR331 features and benefits and fits into a standard 3.5 inches bay for easy integration. Together, these features provide SCM with the unique ability to offer high performance and cost effective solutions. The SCR333 is the industry's first to offer on-board flash. This enables future firmware and application enhancements that guarantee against obsolescence.