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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