Affordable Buzzers Wireless BIG DADDY Tabletop Quiz Game Buzzer with free quiz game software Price shown is for ONE buzzer. Two or more buzzers are required to conduct a quiz. Change quantity when placing your order. USB Receiver included with purchase of TWO or more buzzers. One receiver serves up to 50 buzzers. No drivers needed. Players race to answer quiz questions by pressing their buzzer button - 50ft range Name of first player to "Buzz-In" is displayed on your computer screen which can be projected for viewing by audience and all participants. Automatic lock-out of all but the first player to "Buzz-In." Includes free EASY QUIZ game software and carry sack. (EASY QUIZ requires free installation of Java 8 from java.com.) Also compatible with 3rd party quiz software that accepts number key input such as Game Show Presenter.