Bank card size light, tt's about the size of a credit card, you can easily put the wallet inside; So small a card can actually be used as lighting, its shape is very interesting; The interior has a bulb-shaped hollow, when the need for lighting can be the "light bulb" to put up, you can light up; LED card light using LED as a light source, an area with a bank card the same size; Electronic parts with high-capacity lithium battery, LED lighting will illuminate the bottom, on the contrary, then the merger will automatically shut down; Usage: advertising, lighting, jewelry, ornaments, gifts, brand promotions, and more! This is a very good promotional advertising products; It features affordable printable guests designated LOGO, trademarks, logos, and text; Thin, lightweight, portable, lighting function.