1. Electrical parameter measurement function (voltage, current, active power, electricity) 2. Overload alarm function (exceeds power alarm threshold, backlight and power flash to indicate) 3. Power alarm threshold preset function (user-defined power alarm threshold setting) 4. Power button reset function 5. Power-down data saving function 6. Large LCD screen full display function (simultaneous display of voltage, current, active power, and electricity) Display format: - Power: test range 0~22kW - 0.0~999.9W for values under 1kW - 1000~9999W for values above 1kW - 10.0~22.0kW for values of 10kW or higher - Electricity: test range 0~9999kWh - 0~9999Wh for values under 10kWh - 10~9999kWh for values of 10kWh or higher - Voltage: test range 80~260V; display format 80~260V - Current: test range 0~100A; display format 0.00~99.99A Button functions: - Backlight control: Short press to turn backlight on or off; backlight state is saved automatically when powered off - Reset procedure: - Step 1: Press and hold button for 5 seconds until the number in the battery display window flashes, then release - Step 2: Short press the button again to clear power data and exit flashing mode - Step 3: If button is pressed and held for 5 seconds until flashing stops, battery data is not cleared and exits clearing mode Power alarm value setting: - Step 1: Long press button, release when LCD displays "SET" to enter power alarm setting mode - The power section displays the current alarm value; the lowest digit flashes. Press the button to increase the value by 1. If no action is taken for over 3 seconds, the digit will automatically advance. Repeat as needed - Step 3: After setting, press and hold button for more than 5 seconds to save and exit. Active power threshold setting range: 0.0~22.0kW Measurement accuracy: Class 1.0 Color: Black Material: Plastic Size: 11 x 7 x 3.5 cm Package Contents: 1 x Digital display meter 1 x Transformer Note: Light and screen differences may cause slight color variations between image and actual item. Measurement error allowed: +/- 1-3 cm.