The AEA Technology 6050-5100 VNA Site Analyzer with full Vector Network Analyzer measurement suite S11 and S21 ports, Spectrum Analyzer, and FDR (Frequency Domain Reflectometer) measurements. Both models feature full color backlit display with excellent daylight readability. 50 memory slots for saving plots to recall on the Site Analyzer or upload to a PC using Site Analyzer PC Vision™ software (included). They include NiMH batteries with 4 hours continuous operation. Easy to navigate menus, user custom color settings and measurements plot displays. The VNA Site Analyzer has one-button revert to be just an SWR & Return Loss meter if desired. This makes it flexible for both the novice and engineer level person to use with minimal training. PC communications is via USB-2 (cable included).