Google developed Project Glass, which produced Google Glass - an augmented reality headset that functions like a smartphone and displays information through a lens. Google Glass was available for beta testing in 2013 for $1,500. It uses voice commands and has Bluetooth, WiFi, and runs on Android. Early versions were titanium framed glasses compatible with prescriptions. Google Glass allows for hands-free tasks like maps, photos, and calls without taking out a phone. However, critics argue Glass can be distracting, rude to others who aren't aware they are being recorded, increase stress, and are awkward to use for regular web surfing.