Two more small tips from practical experience: - I would recommend a wireless remote control, not a pure timer that you have to constantly reprogram. It does not cost much more either.. - Make sure that the control electronics retain their settings after a power outage. Otherwise, you have to constantly reprogram them again. Unfortunately, we have neither (since the house was bought finished), and now I have to freshly program all 18 roller shutters individually every 14 days.