Shah Rukh Khan has upgraded the security at his residence Mannat by installing several high-tech devices. When you are one of the biggest superstars of the Hindi film industry, it is expected that you will settle for nothing but the best. While Shah Rukh Khan's Bandra's residence Mannat has always had tight security, the actor recently upgraded the security level by installing state-of-the-art devices at Mannat. It is SRK's way of ensuring that no harm comes to his family or staff at Mannat. Commenting on the high-tech devices SRK has installed at Mannat, our source said, “Shah Rukh has installed bullet-proof windows in his house. The bullet-proof glass is from Germany.” Shah Rukh's concern for safety does not end there. Other than the bullet-proof glass, Shah Rukh has an identifying device in the elevator. The doors of the elevator only open when SRK or his family calls for the lift. If SRK or his family has visitors, a security guard has been specially assigned to escort guests into SRK's house. “The guard has a swipe card with which the doors of the lift open,” added our source. While Shah Rukh refused to confirm the story, our source said, “Shah Rukh is always concerned about the security of his family and the people who work in his house. He doesn't want to leave any stone unturned to ensure their safety. Shah Rukh is a very caring father, husband and boss.”