Shop Glass XTR4

1. Tests conducted by a 3rd party independent lab; tested up to 11X stronger than traditional glass screen protection.  

2. Chang AM, et al. Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences of the United States (PNAS). January 2015. 112(4): 1232-1237

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