Features: Easy and convenient to use and set. Can be used only for indoors, can not be used for outdoors. High accuracy, 4-in-1 multifunctional multimeter, widely application. Can be used for assembly line testing, electronic maintenance, electronic DIY and more. Come with electicity measurement, voltage and current alarm, electricity clearing, data saving, LCD screen, backlight function. Specifications: Material: Plastics Size: Approx. 9.1x5x2.3cm/3.58x1.97x0.91in Volt: Test Range: AC85-400V Display Format: 00.0-000V Current: Test Range: 0-20A Display Format: 0.00-19.99 Power: Test Range: 0-4400W Display Format: 0-9999W Electricity: Test Range: 0-9999KWH Display Format: 0-9999WH(Below 10KW), 10-9999 KWH(Above 10KW) Color: White/Blue Package Includes: 1x Multimeter note: 1. Voltage threshold alarm setting Step 1: Press and hold the button for 3 seconds to enter the voltage threshold alarm setting page, press and hold the button for 2 seconds, short press the button to switch submenus. On any menu-page, press and hold the button for 2 seconds to enter the setting. Step 2: Press and hold the button for 1.5 seconds to enter the second digits setting, short press the button once to change the value. After the voltage threshold alarm value set, press and hold the button for 3 seconds to save the valve. 2. Current threshold alarm setting On main page, long press the button for 3 seconds to enter the current threshold alarm setting page, then long press the button for 2 seconds to display the 00.0V voltage alarm setting, and then short press the button to switch to the SET current display; At this time, press and hold for 2 seconds to start setting the current over-limit parameter. Then press and hold the button for 1.5 seconds to enter the second digits setting, Short press once to change the value. Wait for the current over-limit alarm value After setting, press and hold the button for 3 seconds to save the value. Precautions: Can be used ONLY for indoors. The load shall not exceed the rated-voltage, current and power.