We all write on paper with pens. Have you ever thought about writing in the air? Of course, we won't be using our regular pens, but instead, this air handwriting lamp. It's like a paint bottle; with it, we can write in the air. However, it uses light to write, and both the color and brightness of the light can be changed. It is powered by batteries, and here's the amazing part: the batteries don't need to be charged with a charger. Instead, you can charge the battery simply by shaking the bottle. In this way, the air handwriting lamp can be used an infinite number of times.