1、【Electricity Usage Monitor, Extension Cord】you can virtually monitor standby or working power dissipation of all your electronics. Monitor which appliances are the high cost of energy. save energy, money, Reduce CO₂emissions, environmental friendly. exte 2、【Upgrade Blue Backlit LCD Display】The digital large backlit LCD display screen is 180° full wide view clear visible, make you easy to read and record the data, especially in the darkness 3、【Overload Protection】 When the whole power exceeds the rated power 1650W of monitor, LCD will display "OVERLOAD" with booming noise to warn the user, and automatically disconnect the power 4、【Various Parameters Measurement】CO₂ Emissions(CO₂/KG), Power(W), Energy (KWh), Voltage/Hertz, Amps/Hertz, Power Factor, Minimum power and Maximum power, 8 modes for your choice 5、【Data Hold Function】 It will save the last datas when you remove the appliance from power meter or remove the power meter from the socket; If you're not satisfied with it, please feel free to contact, We take full responsibility for product quality New features increase carbon emissions, full viewing angle, backlight, relay power failure protection Working voltage: 120V, 60HZ Working current: up to 15A Voltage range: 110V ---- 130V Time display range: 0secong ---- 9999days Wattage display(watts):0W ---- 1800WVoltage Display range: 0V- --- 9999V Current display (ampere): 0.000A ---- 15.000A Frequency display: 0Hz ---- 9999Hz Minimum power display range: 0W ---- 9999W Maximum power display range: 0W ---- 9999W Cost display: 0.00KWH ---- 9999KWH Product introduction Power meter, the main function is to display the electricity consumption, voltage, current, frequency of the electrical appliance, calculate the electricity cost of the electrical appliance through the formula, and add new functions. Calculating the carbon emissions of electrical appliances by formula is mainly an environmental concept. The most important function is to calculate the electricity consumption and electricity costs of the electrical appliances.