Here is a wristwatch that you can program to work on your own smart wearable ideas. The watchX is Arduino compatible. It can be programmed with Scratch or Atmel studios. watchX can be used to play games, track fitness activities, and do a whole lot more.
This smartwatch has a 1.3″ display, Bluetooth, real time clock, and accelerometer/gyroscope. It has a 130mAh battery inside in addition to pressure and temperature sensors.