PG21MSSB Advanced Door from Alarm Lock is a quick and inexpensive solution when faced with security vulnerabilities from doors being propped open in schools, restaurants, stores nursing homes, and theaters. Whether door-propping occurs for quick returns from taking “smoke” breaks, to permit insider jobs, or to allow unregistered visitors or contraband to circumvent main security entry points, it remains a problem for facility managers and security officers everywhere. This surface-mount, narrow-stile microprocessor-controlled door alarm quickly improves security at any single or double door with a 95dB alarm, entry delay, key-removal, and auto-shutdown/reset options.