Check the listing for details. 12VDC Fail-Secure/Fail-Safe Adjustable Electric Door Strike Lock - Black. Condition: New. Listed at 33.29 USD. Switch Fail-Secure (power-off lock) for banks/data centers or Fail-Safe (power-off open) for fire exits via built-in jumper. 1 x Electric Door Strike Lock. We are willing to solve any problems caused by the product.