Doctor Dungo says not only can the blood be tested quickly and accurately, but you can see the result with a naked eye.

Dungo博士介绍说不仅血液能被快速而且准确地被测试，而且人们还可以用肉眼看到测试结果。

youdao

As the device presents the standard touch experience you're already familiar with, it also broadcasts data that can be read by any camera, but flashes too quickly to be distracting or even noticeable to the naked eye.

ENGADGET: NewsFlash uses high-frequency light to transmit data from iPad to smartphone, we go hands-on (video)