Access Control, RFID Reader, UHF Reader manufacturer / supplier in China, offering Fail Safe White Wire Door Contact for Door Access Control Security (SDC-38NC) Contact for Glass Door Open and Close, Fail Safe Aluminum Wire Alarm Magnetic Reed Normally Open/Close Switch (SDC-55) for Glass Door Open and Close, Fail Safe High Quality Burglar Alarm Magnetic Door Sensor (SDC34A) Reed Switch for Glass Door Open and Close and so on.