Xiaomi is challenging Facebook in the wearables arena by launching its own smart glasses. The device won't only be capable of taking photos, but also of displaying messages and notifications, making calls, providing navigation and translating text right in real time in front of your eyes. Like Facebook, Xiaomi is also putting emphasis on the device's lightness despite its features. At 51 grams, though, it's a bit heavier than the social network's Ray-Ban Stories. In addition, the glasses also has an indicator light that shows when the 5-megapixel camera is in use.