Have you ever used a 'privacy screen protector' on your smartphone? These protectors have a filter that ensures only part of the screen is visible only to the person who is looking at the phone, while the protector will reduce visibility from the left and right sides. Some protectors can also reduce eye strain and filtering out blue light, and we take a look at how these products work on this week's episode of Gadgets 360 with Technical Guruji.