File this idea under "wearable technology we'd actually want to wear." British Esquire introduces us to Tzukuri, an Austrailian eyewear brand launching a line of damn-near indestructible sunglasses. They offer strong UV protection, durable anti-scratch lenses and—here's the real kicker—solar powered bluetooth. Every pair is embedded with a small beacon that sends notifications to your iPhone when you get too far from them.