Our products are built-in cold light film charging LED, real-time response charge, the first one light indicates 25%, and second pieces of the light indicates 50%, the third planet light indicates 75% of the fourth satellites 100%. To an external battery, a light shining, said 25 percent of the lack of electricity, the fourth pieces of the lamp is no longer shiny, fully charged. External battery for iphone charging, the fourth satellites lights flashing when said external battery power for more than 75% of the external battery power runs out, when the first one light does not shine, and timely to the outside The battery can charge.