Amazon I am a customer for many years but this is the first purchase with which I have such a disappointment! These glasses are a useless gadget: first a lamp does not work at all, the other lamp works half the time fiddling the tiny switch and emits more light and qu'indigente largely insufficient to read . In conclusion, I am not at all agree aves other reviews, there is only a Chinese gadget that is not worth its low price, only advantage we can remove the 4 button cells for use on another device! Unworthy to be on the panel Amazon
