Charge every 3 months if not used. Replace battery every 2 years (type CR2032 or 18650, see label).
Attach the front header bracket to the wall above the door and the rear bracket to the ceiling. Charge every 3 months if not used
While the manual is efficient for pros, its highly technical nature may be dense for DIY users. It explicitly states that installation must only be performed by to maintain compliance with safety directives like EN 12445 and EN 12453. Charge every 3 months if not used