So you are not impressed with the Apple Watch? Maybe this Apple II Watch will do. This cool wearable device has a basic user interface and a knob that allows you to navigate the menu. It also features a small speaker and two disk drives. Aleator777 has put up a guide that shows you what it takes to build this watch.
You will need a Teensy 3.1, a 1.8″ TFT LCD, a 800 mAh battery, and a few other things to get started. The battery life should last about 3 hours. You can find out more about this Apple II Watch on Instructables.