Here is my current list of desirables

- bluetooth discoverability: so any phone can connect to it and send it data (two way communication NOT required)

- bluetooth communication including

-- phone sends message to display watch, not necessarily SMS

- magnetometer to track movement like gestures like left/right and show compass direction

- utilization of a battery with display of battery remaining

- ability to recharge battery via typical USB

- display that turns on with a button press (for the first version)

- watch functionality including

-- timer

-- stopwatch

-- set time and date

-- show current month calendar

-- change display between digital and analog

- display

-- I've played with the basic types of displays like ST7789

-- I would prefer a screen that's about 1 1/2 inches (38 mm) in diagonal

-- I would love high pixel density, but I don't know what I could use or the downsides