designer's own words:AA USB was developed in the process of answering the question, “Can we benefit from routine, unintentional pattern of behaviors?” When you use a memory stick, you may leave it inserted for several hours. What if a memory stick can be charged like an MP3 player or cell phone that can be charged through a USB port? AA USB is a memory stick with a lithium-ion battery inserted, which you could use as an AA-sized battery in emergency. Students or office workers mostly carry a memory stick. If a memory stick could be used as an emergency battery, its use would be versatile, ranging from camera and lantern to speakers and other devices. The amount of electricity charged will be indicated with a small LED light when you hold the two tips of the battery with fingers.