Yellow light

Yellow light means caution and an uncertain score. It may also signal a lack of price or price premium data, and the inability to flash a green light or red light.

Probably in this instance, the end user will want to review the detailed comments about the product looked up by barcode. This will be note in Simple English about issues with, and merits of, the product. Probably filtered from opinion wiki.

Hardware requirements to make this easy at point of purchase are severe. It may be these requirements that kill the project! So coordinating with other essential projects is quite important. One of those other projects may actually help justify the hardware.