Tytron Differences

What are the differences between the Tytron C-6000, C-5000 and C-3000?    Model  C-6000  C-5000  C-3000 Sensor Technology Infrared Infrared Infrared Connectivity Wireless USB Serial (USB adapter included) Plug-and-play Always connected to computer with the wireless hub Yes, scanner automatically loads it's correct calibration values Needs calibration values loaded prior to use Power Source Rechargable Lithium Ion Battery USB (great for portability) Needs external power supply or 9v battery adapter (included) Status Indicator Yes,Battery charging, In Use and Battery Low Yes No Color Stealth Black Silver with black trim Black with white trim Availability Reserve spots open In stock and ready to ship Discontinued, no longer available Price Call for current pricing