Schlage Locknetics 740 Series Emergency Break Glass Releases are designed for use as emergency releases of non-designated egress doors such as in individual and partitioned laboratories, secluded testing areas, or other isolated work rooms that are purposely provided with exit doors. In perimeter protection systems that involve the central control of electric locking devices, an on-site emergency release may be required. The "break glass" concept may be preferred over the pull station, because it is less vulnerable to misuse or tamper actuation.