Bluetooth devices use radio waves to connect. It makes the things we do every day so much more convenient. No wires, cables, or cords, allows you to take computers, game controls, and many other objects from room to room. But how does it work? Learn about the signals these devices send to talk to each other and make your technology easier to use. This book will allow students to use tools and materials to design and build a device that uses light or sound to solve the problem of communicating over a distance. --