This image illustrates the side of the ISEB6 which faces inwards, towards the wearer. The single largest component is the LiPoly battery. In this instance an 850mAh battery is installed. Capacities up to 1300mAh should fit in the available space. In addition, there is a LiPo charger board with USB port, and a simple voltage divider for sensing battery voltage. Finally, the two GSR electrodes are visible. For simplicity and dependability, gold-plated earrings were chosen as they are inexpensive, conductive, and non-corroding. Plus, I happened to already have some, so they were handy.