L’Oreal UV Sense

With summer nea4ly here cosmetics brand L’Oreal has a battery-free wearable that measures UV exposure. At only 2mm thick and 9mm in diameter, the tiny electronic sensor doesn't pair over Bluetooth or Wi-Fi to your phone. Instead, it's NFC-enabled so you can scan it with your phone to retrieve the UV data it has collected. It can be worn on a fingernail or pair of sunglasses and will give you warnings about sun exposure via an app.