It’s for the Bluetooth piece. The optical sensor reads the result and the turns on the light and/or lets the phone know over Bluetooth.
Seems unnecessary, but if people want to buy it…
Seems unnecessary, but if people want to buy it…
Considering that this is an article used once for a few minutes the environmental cost for production and deposition is high and society shouldn't tolerate ...
Otherwise, I agree, seems wasteful when you look at what had to happen to ship that product.