I am really confident and happy with my purchase. It seems blue blocking devices are the new craze for snake oil salesmen, so it's really reassuring that BlockBlueLight sell a quality product that is guaranteed to work. When the screen is locked and in the sun, you can see the purple/blue tint it gives off (this is not visible in normal circumstances) - which proves the blue blocking qualities. The touch effectiveness is great too. Very happy with this product, and the customer service is beyond excellent!
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