Electric strikes offer an economical way to secure standard doors and are suitable for most cylindrical door locks. Fail-safe and fail-secure strikes are available. Electric dead bolts provide superior security and safety and include fail-safe operation for doors. Dead bolt options include lock sensor, door sensor or lock and door sensor models to indicate status of the lock (locked, unlocked) and/or door (open, closed). These electric strikes and dead bolts are designed for indoor use only.