The PD-100830 is a Hold-Open Magnet from Lockwood that comes in 1, 2, 3 and 4 hold, shock absorber and interrupted button options. The EM830 Series of Hold Open Magnets can work as standalone or with an integrated fire system. These failsafe devices will automatically release if connected to a fire detection system. Some models include integrated "interrupter buttons" giving the ability to open or close the door manually at any time. Other models have an integrated soft close shock absorbers for silent operation i.e. in Hospitals.