The II PD type manual smoke vent button is intended for the controlling
of smoke dampers, providing a simultaneous local 1- or 3-LED light signalling, depending on design.
In the case of a 1-LED signalling, activating the button makes the LED flash red, while pressing the button on a 3-LED signalling system makes the LEDs emit continuous light and indicate the following: detection (green), failure (yellow), and activation (red). The button is equipped with passive electronic components.

The button meets the requirements regarding products intended to
ensure public safety or to protect health, life and property (Journal
of Laws 2007, No. 143, item 1002; Journal of Laws 2010,
No. 85, item 553), and is in accordance with Directive 93/68/EEC
of 22nd June 1993.