An electronic access control door can contain several elements. At its most basic, there is a stand-alone electric lock. The lock is unlocked by an http://sreemothercbse.com/modules/gps/free-spy.php operator with a switch. To automate this, operator intervention is replaced by a reader. The reader could be a keypad where a code is entered, it could be a card reader, or it could be a biometric reader.
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