Thanks; I am not surprised. It's hard to imagine how a sensor could be made to work cost-effectively - something that detects whatever ambient solar radiation slips through clothing? Whatever, consumers aren't going to pay for that.

But in fairness, the sensor doesn't work with how people use it. We could make a sensor that straps to user foreheads and requires them to always face the sun. When integration fails, we can point the finger either way, or just say it wasn't a good fit.