The QS2000 or Quicksilver 
                    2000 system is primarily found in its digital board based 
                    model. The QS2000 single antenna is used to expand a 3 foot 
                    system in to a 6 foot system. 3 QS2000 antennas can be used 
                    to cover a 6 foot door. 2 QS2000 antennas can be used to cover 
                    a 3 foot door. The QS2000 expansion antenna is primarily a 
                    receiver or Rv antenna. A transmitter or Tx board can be used 
                    if needed. This is accomplished by slaving the 2 transmitters 
                    together. The QS2000 is commonly seen in Walgreens stores. 
                    QS2000 checkpoint antennas can be tuned to 8.2 or 9.5 frequencies. 
                    8.2 is the most commonly used RF signal in the electrnic article 
                    surveillance world.
Buy this Checkpoint Systems QS2000 Single Antenna System refurbished with warranty.