Snapchat is the sunglasses, which record videos in 10-second increments. Its camera has a 115-degree lens meant to more closely approximate how humans see. Tap the button on the top left-hand corner of the sunglasses to begin recording a snap. It will automatically stop recording after 10 seconds but if you want additional recording time, you can tap again to add another 10-second increment. There is an inward-facing light that turns on when you're snapping, and an outward-facing light that alerts anyone in your field of vision. You can record up to 30 seconds at a time. You can use the glasses as a standalone device — they'll store the snaps until you return to your phone.