Using Qi wireless charging technology, your Samsung or iPhone or other Qi compatible devices can be automatically identified and quickly charged when placed on the charging pad. The QI wireless charger has a unique light up technology making this product perfect for laser engraving. Once connected to power through the type C cable provided, the circle LED indicator light turns green and is ready for charging. When you put a smart device on the charging pad, the circle LED Indicator light will turn to blue breathing light while working.