It's always cool to save some money, but coupons themselves typically aren't things that have a coolness factor, unless you've got one of the unique coupons from Zealios Skin Care on hand.
To encourage people to go soak up the sun this summer, the company is offering a 50% off coupon for its Skin Barrier sunscreen products, but in order to get the discount, you can only get access to the deal in direct sunlight. If you've got an Android device, the sun-activated coupon can be downloaded from Zealios' website. If not, there's still a 20% discount for other phone users, but this coupon that makes use of a phone's light sensors is a really fun way to save money, plus pick up a few sun safety tips in the process.
Zealios Skin Care's Unique Coupon Only Appears in the Sun
Laura McQuarrie — July 24, 2014 — Tech
References: coupon.zealiosskincare & designtaxi