Working principle of card lamp

The light source adopts LED and large-capacity button lithium battery, which can be as thin as a card. When the carved part of the light bulb shape in the middle of the card is folded upwards, the LED will be lit, and the whole light bulb part will glow, just like a miniature LED desk lamp standing on the desktop. When not in use, as long as it is merged, the LED will go out automatically and it will change back to a card. It's that simple.