After the fire, the MGM Grand was rebuilt over the next eight months, at a cost of $50 million. It reopened in July 1981, with numerous fire safety features now in place, including the addition of fire sprinklers and an automatic fire alarm system throughout the property. A two-unit computer – one of them a backup – was provided by Johnson Controls to monitor hundreds of locations throughout the MGM, helping to prevent another fire. A similar computer had also been installed at another MGM Grand hotel in Reno, Nevada. The Las Vegas MGM now had more than 30,000 sprinklers, including four in most hotel rooms. The hotel also had 8,000 speakers, including one in each room, allowing for fire safety instructions to be provided to guests in the event of a fire.