It is very light weight. Cost is approx. Expands indefinitely to allow as Many players as needed. One year manufacturer's warranty on defects in material and workmanship, assuming normal use. Moderators panel has small lights which show which team rang in.
Players have a box connected by cable to moderators box.
Each player has a small light bulb on his box which locks out other players once you press the button to ring in. Locks out all other responses until reset. Ask for it, if ordering this system. Designed for High School Certamen. System is a box with 12 or 16 thumb activated buzzers held in hand at end of long chords.