Features: Reset the power and time-buttons. Power failure data saving function. Backlight function. Overload alarm function: exceeding the power alarm threshold, backlight and power flashing prompt. Voltage alarm function: exceeding the voltage alarm threshold, backlight and voltage flashing prompt. Electrical parameter measurement function: voltage, current, power, energy consumption, impedance. Package Includes: 1x Multimeter Specifications: Material: ABS Measuring Voltage: DC6-200V Measuring Current: 0-20A Measuring Power: 0-4KW Measuring Energy Consumption: 0-99999KW On Load Timing: 0-999 Hours (Overflow to 0) Measuring Impedance: 0-999 out of Range Display--- Overload Alarm: Can be Set Voltage Alarm: Can be Set, Overvoltage Undervoltage Wiring Type: Fence Type Wiring-Terminal Installation Method: Embedded Module Size: 68x68x22mm/2.68x2.68x0.87in Panel Opening: 63x63mm/2.48x2.48in note: Positive and negative must be distinguished while wiring, and AC power cannot be input. Button Description Press the button briefly to switch power, energy consumption, and impedance. Press button-Two quickly to turn on or off the backlight. Press and hold for 6 seconds to enter the setting mode. Press and hold for 3 seconds to move to the next-group. Hold the button for 2 seconds in each group to automatically jump to the next-group. Without any operation, exit in 10 seconds and save data.