Serial DC Power Monitor & Real Time Software / Data Logger (Windows Or MAC OSX) Displays & records data, -75 to 105 DC Amps, Watts, KWH, Amp Hours AH Dimensions: 4"x 2.5", Comes with DB 9 Pin connector for RS232 Communication. For USB version of this product then do Amazon search for product code "B00ETF84CI" . If you use this Sensor with your computer it will need to have a DB 9 pin port, or you will need to provide your own USB to Serial Adapter - Recommended: Do an Amazon search for the FTDI serial to USB converter. Wattsview Software connects to up to 10 sensors at once, for Windows - or MAC OSX Great for all DC Monitoring & Data logging Including Solar Panels, Wind Turbines, Hydroelectric, Pedal Power, & thermoelectric. To see a typical installation for a solar application take a look at the listing image of a 5 Way Solar Combiner box. The WattsVIew sensor is mounted inside the combiner box with a cable going out to to the computer. Note: for wind turbines with three wire output, the WattsVIEW will need to be wired between the bridge rectifier and the output of the system. (NOT between the Wind Turbine and the bridge rectifier). Measure up to 200 Volts DC and from -75 to 105 Amps with your computer Displays real time data graphs, logs data to your computer hard drive, Volts, Amps, Watts, Watt Hours, Amp Hours