Some random pics...

It's not just a watch, it can have a belt clip attachment too!
The world's smallest pocket calculator perhaps?
It will even fit in a large fob pocket.

 

 

Left side view showing the Microchip ICSP interface.

Right side view showing the universal serial I/O port.

Under the hood!

Inside the battery compartment.

 

The backside case.

Ooh, a translucent version!

 

The watch band attachment.

One of the soft key menu displays.

The setup mode.

Algebraic entry mode. Yreg on top with current operator and parentheses level on the right. Xreg on the bottom.