This is the 100 amp e-Logger V4 On-Board Data Logger from Eagle Tree Systems. FEATURES: Great for planes, helis, car, trucks and boats Accepts optional inexpensive sensors for GPS, temperature, RPM (brushless, magnetic or optical) airspeed, altitude, servo current and more Logs throttle movement with optional Y-cable Four times the memory capability of the V2 Current measured with a true Hall Effects sensor-not a resistance shunt that creates heat and robs power from the system Fully compatible with Windows Vista, 98SE, ME, Win2K and XP USB live mode support displays info from the model live on the bench on modeler"s PC All data is logged to permanent memory, which retains data even when power is removed, adjustable logging rate (1-10 samples/second) and lossless data compression for long log times State of the art Windows virtual playback display and graphing Internet updatable firmware One year limited warranty INCLUDES: 100 amp e-Logger V4 On-Board Data Logger, USB cable, and CD manual REQUIRES: Installation and setup following instructions on CD-ROM SPECS: Voltage Measurement: Approx 5V to 70V Voltage Resolution: Approx 0.02V Current Measurement: up to 100 Amps, (150 Amps with the MPRV3-LEADS-150) Current Resolution: approx 0.02 Amps (0.035 Amps with the MPRV3-LEADS-150) Current Draw: Approx 30 mA with no sensors Weight: Unit with Integrated Connectors: 0.9 oz (25 grams) Temperature: Dual inputs, 0° F to 424° F (three temp inputs) RPM Range: Approx 100 RPM to 50,000+ RPM Units of Measure Supported: English and Metric Size: Approx 2.25" x 1" x 0.5" (57mm x 28mm x 13mm) including sensor pins Length of Wires: Approx 2.5" (65mm) Record Time: Varies with sample rate, parameters being recorded, and "activeness" of model. Anywhere from around 45 minutes to many hours is attainable depending on these settings. jxs 2/26/08 ir/jxs