Features Electrical parameter measurement function (voltage, current, active power, energy, frequency, power factor) Overload alarm function (over power alarm threshold, backlight and power flashing to alarm). Power alarm threshold preset function (can set power alarm threshold). The energy can be reset use the key. Store data when power off. Specification: Model: PZEM-022 Working voltage: 80 ~ 260VAC Test voltage: 80 ~ 260V ACCurrent:100A Rated power:100A/22000W Operating frequency: 45-65Hz Measurement accuracy: 1.0 grade Size: 9*5*2.5cm/3.5*2*1in Wire length:19cm/7.5in Weight: Approx.110g/3.9oz Package list: 1 x AC Multifunction Digital Meter 1 x Closed Type CT Note:1. This module is suitable for indoor, please do not use outdoor. 2. Applied load should not exceed the rated power.3. Wiring order can't be wrong. Package List 1 x AC Multifunction Digital Meter 1 x Closed Type CT