Walkie-talkies (generally known as HTs or "handheld transceivers" by radio hams) are widely used among amateur radio operators and have become popular with consumers for personal use. Most personal walkie talkies that are sold are designed to be very compact, with buttons for changing channels and other settings on the face of the radio and a short, fixed antenna. Most such units are made of heavy, often brightly colored plastic cases to attract consumers.