beam – n. to send or broadcast something, such as a radio signal

debut – v. to show or provide (something, such as a product, television show, etc.) to the public for the first time

desktop – n. the workspace of a personal computer; a computer that is designed to be used on a desk or table

headphones – n. a device that is worn over your ears and used for listening to music or a radio station without having other people hear it

fiction – n. a story that describes imaginary events and people

3-D – adj. involving something that has height, width and depth

ultrasonic – adj. used to describe sounds that are too high for humans to hear

pocket – n. a small enclosure added to clothing and used for carrying small objects

stereo – n. a way of recording and playing back sound so that the sound comes from two directions

demo – n. short for demonstration model