Prime energy of magic shoes is nuclear cold fusion energy derived from Palladium. Palladium is transition mental. It has silver. It is organized in Platinum mental or PGMS that consists of platinum, rhodium , ruthenium ,iridium ,osmium. Palladium we are familiar from the Ironman movie, so to speak core energy of magic shoes is as same as arc reactor in Ironman. Limitations of magic shoes are based on the format of each mode. Flying mode uses the most power. Jumping mode, walking on the water mode,running fast mode use power equally. And sporting mode is the least using power of all modes because it cannot help us play better including general shoes such as fashion shoes, sneaker, high heels shoes and so on. When the energy is below 20% ,the shoes back to the normal mode automatically to save energy for use as critical situation. If the energy is equal to 0%, this shoes will become sandals which cannot changes any mode. And then charging battery is the same as mobile phone.