Electric Door Strike Remote Unlock Mechanism for Security Alarms, Keypad Entry, & Audio Video Door Phone Intercom Systems (12V DC) Unlock your door from anywhere in your home or business Works with any door strike compatible keypad, alarm system, or intercom system with a 12V DC output Compatible with wooden, metal, or glass doors Click noise lets visitors know when the door is unlocked Fail-locked design ensures your safety by staying locked even if power is lost.