Photo of a pushbutton door opener/swing door operator
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/60756254@N07">Wheeler Cowperthwaite</a> from Reno, USA
CC BY-SA 3.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wcowperthwaite/5758729447/">pushbutton_door_opener</a>