Signal Hound USB-SA44B 1 Hz - 4.4 GHz Spectrum Analyzer 1 Hz to 4.4 GHz, -151 dBm to +10 dBm Resolution Bandwidths 0.1 Hz to 250 kHz, 5 MHz Measure AM / FB / SSB Modulation, Demodulate to Audio 480 Mbps USB 2.0 Interface for Fast Data Transfer Hardware and Software Included at One Low Price