Heavy Duty Electric Strike Lock ANSI Standard Fail-Secure/Fail-Safe Adjustable fit for DC Electric Door Lock Door Access Control System Mortise or Cylindrical Lock, Input Voltage 12VDC

works for my needs. easy to install. haven't needed to try the fail secure but much cheaper than other ones.

This thing was exactly what I needed at a great price. Function is quiet and reliable. I will purchase again.

Very light duty that does not work must of the time. Save your time and money. This is a toy!!NO technical support and NO help.

Notes:* Solenoid tests fine (12 VDC).* Instructions are ok but, allegedly, you can change the device from fail secure to fail safe through the changing of a screw.* I tried several ways to set it to fail safe (when no 12 VDC power is present, the door is strike is unlocked), and I could not get it to work. There is only one screw hole. I thought it might be some kind of mechanical switch, so I tried to slide what I thought might be the switch, and that didn't work either.* Basically, the instructions don't match up to the functionality. Most won't be able to use this in a fail secure operation (you lose access control power and the door stays locked, making egress impossible).