Compact and comvenient, easy to use. This product will make your life easier and more convenient. Features: 1. The electrical parameter measurement function (voltage, current, active power, energy, frequency, power factor) 2. Overload alarm function (over the power alarm threshold, backlight and power flashing alarm) 3. Power alarm threshold preset function (can set the power alarm threshold) 4. Energy can be used reset key 5. Store data when power off 6. LCD large screen 7. Backlight function 8. Key Backlight control function Short press the key to turn on or off the backlight, the backlight has memory function, it can store the on or off state when the power off. Reset energy Step 1: Long press the key for 5 seconds until the energy flash, then release the key. Step 2: Short press the key again, the energy value is cleared and exit the flashing reset state. Step 3: If there is no operation on the key within 5 seconds, it means the energy value is not cleared and will exit the reset state. Set the power alarm threshold Step 1: Long press the key until the LCD display ?SET CLr?, then release the key to enter the setting state Step 2: Power window display the current power alarm value and the last digit starts flashing, you can short press for plus 1, when there is no operation for more than 3 seconds, it automatically switches the digit position, the setting method is the same as above. Step 3: After finishing the setting, long press the key 5 seconds automatically memorize and exit, the active power threshold range is 0.0 ~ 2.5 kW. It can display six parameters at the same time. Specifications: Working voltage: 80 ~ 260VAC Test voltage: 80 ~ 260VAC Rated power: 100A / 22000W Operating frequency: 45-65Hz Measurement accuracy: 1.0 grade Size: 9 * 5 * 2.5cm Cable length: 19cm Weight: Approx.110g Display format: 1.Power Test range: 0 ~ 22000W Measuring start power: 0.2W