Product Detail 2-channel oscilloscope, function generator, spectrum analyser, recorder, and bode plotter. Just plug the single 8" tall x 2-1/2" wide x 7" deep PCSGU250 device from Velleman Instruments® into the USB port on your PC. Input range: 10mV to 3V/division (sensitivity: 0.3mV). Input coupling: DC, AC and GND. Maximum input voltage:30V (AC and DC). Markers for amplitude/voltage and frequency/time. Storage of display and data. Requires Windows 2000, XP or Vista. Call for additional specs. . The "2-Channel PC Oscilloscope, Function Generator, Spectrum Analyser, Recorder, and Bode Plotter." is best product for you. We recommended 2-Channel PC Oscilloscope, Function Generator, Spectrum Analyser, Recorder, and Bode Plotter.