This is a coin cell holder for the common CR2032 type battery. The holder has a neat pop-in, pop-out feature that makes changing the battery easy.
These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry.
This 3.6V 170mAh rechargeable Ni-Cad battery contains three cells in pyramid configuration.
This is a general purpose unregulated power adapter that converts 120VAC@60 Hz (North American) to 6V DC at 500mA.