Our wireless keyboard is the first distance 30m in the world. Why we need such long distance? Now the wireless keyboard distance is all below 10m. But for real usage, especially in living room, many furniture, many electronics facilities interfere each other, the real distance will decrease to 5m. If you have a 50inch big screen TV in front, how can you sit within 5M watch the program? This is a replacer of Presenter so teacher can feel free just take our long distance keyboard to teach via projector. The marketing comparing I can analyze by PowerPoint in attachment as well.