When you Stand the bulb up, light  on.

When the bulb is embeded into the card, light off.

Convenient and easy to use. This product is as large as a normal credit card which can be put  into your wallet, purse, or pocket with ease. It's very easy to carry.

What's more, you can put your LOGO or advertisements on the whole card at  both sides.

It is a perfect gift for friends and family, and also can be a ideal promotion item. You may have one~