1, in case of emergency, putting the internal staff can escape at any time, played the role of fire; in non-emergency situation, do not push the alarm lock lever to open the door, alarm lock lever will push the alarm, the alarm sound to 100 dB 2 to prevent unauthorized outsiders not enter inside, play a security role. 3, with the access card out without touching the alarm, user management. 4, clearly visible promoter configuration, a solid anti-saw bolt to provide solid protection, can withstand over 2200 lbs of external tension; 5, provide round-the-clock protection, static use of the battery capacity of a year, and no additional maintenance and operating costs.