Features 7 COMPAK Transceivers 7 Cyber Headsets 1 XT Com-Center Batteries, Chargers, Padded Case Description Product Description COMSTAR full duplex wireless is designed specifically for teams that need to communicate and work with their hands. These revolutionary intercoms are not voice activated and there is no delay when transmitting. Whether officiating football, lacrosse, rugby, soccer, or any team sport, Eartec Wireless Communication Systems for Referees will give you the edge you need. The system allows up to eight (8) wireless users to talk simultaneously just like on a regular telephone within an 800 yard range. Each referee has a MIC MUTE button as well, allowing a push-to-talk feature for those referee teams that prefer silence between transmissions. COMSTAR intercoms feature miniature belt pack transceivers that weigh only 2.5 oz., and a lightweight cyber headset for crystal clear communication. The system utilizes the low power 1900 MHz band, so no FCC license is required. The COMSTAR is free from all outside interference, including microwave, internet, scoreboards and other wireless headsets that operate in the congested 2.4 GHz non-licensed band.