Hi guys, if you are using iPhone, iPad, Mac Book, tablets, cell phone or any other devices then be alert with blue light Rays because it makes us unable to sleep better and we always feel dissatisfaction sleep after wake-up in the morning. Blue Light Rays produced from any device you own that has a screen. You must save yourself from blue light Rays and use anti blue light protective screen for your device. I hope you will feel happy after use it. Thank you!