Specifications:Operates voltage: 4.8V-60VOV with optional auxiliary batteryMeasures:0-150A， resolution 0.01A; 0-60V， resolution 0.01v; 0-6554W， resolution 0.1w; 0-65Ah，resolution 0.001An; 0-6441Wh，resolution 0.1Wh; backlit LCD displayPackage size: 13 * 8 * 4cm / 5.1 * 3.1 * 1.6in Package weight: 127g / 4.5oz Package list: 1 * 150A Watt Meter and Power Analyzer 1 * Manual