Glass breaking button, also known as emergency button, is connected in series on the electric lock ring to prevent the hardware failure of card reader, button or controller in the access control system, and the personnel inside can not open the door. Features: New emergency release alarm button for broken glass. Support electrical control or access control system. Use durable plastic shell, easy to install. Use fire-proof materials to meet safety requirements. Sandblasting panel, elegant style. It is the best protector for home, shopping mall and other places. Witnesses only need to break the panel glass of the fire safety alarm button in intensity to send the fire alarm signal to the controller and send part of the fire alarm signal. Specifications: Control mode: glass breakage trigger Connection Port: Common End, Normally Closed End, Normally Started Transmission power: