This is the Eagle Tree V2 Electric Expander. Compatible with the Eagle Tree Flight Data Recorder V2, Car Data Recorder and Boat Data Recorder. Not compatible with the Flight Data Recorder V1. **Will not function with the new V3 Elogger.** FEATURES: Measures motor current by means of a tiny lightweight Hall effect sensor ring which can be installed around the positive or negative wire leading from battery to speed controller Battery pack current is measured by the alligator clip attached to an exposed part of the positive wire between the battery and speed controller One year limited warranty INCLUDES: One Eagle Tree V2 Electric Expander with instruction sheet REQUIRES: Connecting to battery and recorder and configuring expander to the data recorder and application SPECS: Motor Voltage: 0-50V Motor Current: 0-100amps with approximately 50mA resolution Weight: 0.3oz (8.5g) Eagle Tree SystemsPart ETRELEC-EXP-100