A smart­watch I would buy

After read­ing an arti­cle about smart watch­es, I tried to come up with a spec of a smart watch I would buy:

  • It needs to look like a nor­mal watch (I wear a stain­less steel ana­log one, about two thumbs wide with the strap being one thumb wide) and needs to be thin (or at least give the impres­sion it is thin, even if it is not).
  • It needs to be an exten­sion to my smart­phone, but being able to dis­play date and time with­out it.
  • It needs to have an open pro­to­col, so that peo­ple can write smart­phone apps which are able to dis­play any­thing they want.
  • It would be nice if the vendor-supplied app would dis­play incom­ing calls/SMS and at least cal­en­dar noti­fi­ca­tions (addi­tion­al noti­fi­ca­tions should be con­fig­urable, I do not want to see “you are roam­ing now” mes­sages, but email mes­sages could be nice when you are wait­ing for an impor­tant one) from the smart­phone. I am not sure how many columns/rows for char­ac­ters there need to be or if it shall be a pixel-display with a spe­cif­ic min­i­mum amount of DPI.
  • There needs to be at least one easy to use by intend but hard to use by mis­take but­ton which switch­es back to the date/time dis­play (and/or switch­es between sev­er­al default dis­plays like weath­er, date/time, agen­da… when con­nect­ed to the smart­phone – again, ide­al­ly this is con­fig­urable in the app). Bonus points for an addi­tion­al con­text sen­si­tive but­ton (e.g. “snooze 5 min­utes” or “dis­miss” for cal­en­dar noti­fi­ca­tions, ide­al­ly this can be con­fig­ured in the app).
  • The bat­tery needs to last long and be easy to replace (like with my cur­rent watch, so it needs to last years). While I would pre­fer a recharge­able way of han­dling this, the cur­rent tech­nol­o­gy is clum­sy (stan­dard­ized con­nec­tors like micro-USB to charge are too big… non-standard con­nec­tors are not an option) and does not last enough (I would be OK if one charge would last near­ly a year).
  • I do not need col­ors, but a good con­trast even in full sun­light is manda­to­ry.
  • Med­ical or life-style sen­sors (com­pass, gyro­scope, blood pres­sure, accelerom­e­ters, radi­a­tion, air qual­i­ty, …) are not nec­es­sary, but as long as they come for free (read: do not make the watch much thick­er), I would not mind.
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