S4A Industrial Co.Limited S4A means Security for all.also it has Serve for all, Security for all, the same meaning. S4A is specialized in RFID Door access control systems for 9years till now, products we are dealing is: Access Control Board (for single door, double door and four door support TCP/IP and web based) Standalone access control (Easy to install and program without software) Fingerprint access control&time attendance (Easy to install and program with software and keep ...