Remote Electrical Control of Any Door Equipped with an Adams Rite 4500, 4700 (Discontinued), or 4900 Deadlatch or Cylindrical Lockset with 1/2" [12.7 mm] To 5/8"[15.9 mm] Latchbolt Projection. Electrical Actuation Unlocks the Keeper, Releasing the Latchbolt so the Door May Be Opened Without Operating the Latch Itself.