<https://www.flex7.co.uk/flex7-applications-pelv-absence-control/>
<http://schema.org/description>
"Control of luminaires is via a flex7 plug-in sensor head and switch, both operating at PELV. The luminaires are manually switched on with a short pulse of the switch, after which they remain on whilst movement is sensed."
<https://www.flex7.co.uk/flex7-applications-pelv-absence-control/>