> Mechanical outlet timers: You plug this into an outlet, it slowly spins once per day, and the pins determine is the outlet is active for each 30 minute period. [...] > Many use these with light for plants. Or, it can be nice to wake up with light rather than sound. Instead of buying a light alarm clock, you can just plug a lamp into one of these.

Beware.

I bought one of these for the bedroom for precisely that purpose.

I accidentally got a brand that clicked audibly as it rotated.

I'm sure the reader can easily imagine how useful that wasn't.