This sounds silly but the one thing holding up the decision to get these (wired) shades is whether they become useless in the event of a power outage (or societal collapse, lol). Do not want the battery version. Can they be manually opened/closed, or do you absolutely *have* to use the motor? Will we be the idiots in the big winter storm (or zombie/climate apocalypse) who have expensive blinds that don't work?