BIRD TECHNOLOGIES' 5017D sensor measures true average power, peak power, and duty cycle directly with exceptional accuracy and uses these precise measurements to calculate a wide range of other important factors, such as VSWR, Return Loss, Reflection coefficient, crest factor, average burst power, and CCDF. Sensor never requires field calibration, only requires calibration once per year and is traceable to National Institute of Standards and Technology (NIST). Included accessories: user manual, VPM3 - pirtual power meter software and manual, 6 ft. USB cable.