Meet the Wearable Wayfinder: a programmable computer that goes on your wrist, allowing you to do all kinds of neat things. This hackable gadget lets you play gesture-based games, track your daily activity, and display digital watch faces and compasses. The device comes with a rechargeable battery and is USB ready. You can use the Wayfinder as a keyboard or mouse to interface with most laptops and desktop computers.
The device is Arduino compatible and features a clock, a compass, accelerometer, and a temperature sensor. You can connect it to other devices using the I2C or serial protocols. If you know your C++, you can have a lot of fun with this wearable. There is a lot to like here.